COSI, INC.

                        5,555,556 Shares Common Stock(1)


                             UNDERWRITING AGREEMENT

                                                           _______________, 2002

William Blair & Company, L.L.C.
  As Representative of the Several
  Underwriters Named in Schedule A

c/o William Blair & Company, L.L.C.
222 West Adams Street
Chicago, Illinois 60606

Ladies and Gentlemen:



       SECTION 1. Introductory. Cosi, Inc. ("Company") a Delaware corporation,
has an authorized capital stock consisting of 40,000,000 shares of Preferred
Stock, $0.01 par value, of which 6,467,751 shares were outstanding as of
____________, 2002 and 100,000,000 shares, $0.01 par value, of Common Stock
("Common Stock"), of which 4,544,893 shares were outstanding as of such date.
The Company proposes to issue and sell 5,555,556 shares of its authorized but
unissued Common Stock ("Firm Shares") to the several underwriters named in
Schedule A as it may be amended by the Pricing Agreement hereinafter defined
("Underwriters"), who are acting severally and not jointly. In addition, the
Company proposes to grant to the Underwriters an option to purchase up to
833,333 additional shares of Common Stock ("Option Shares") as provided in
Section 4 hereof. The Firm Shares and, to the extent such option is exercised,
the Option Shares, are hereinafter collectively referred to as the "Shares."


      You have advised the Company that the Underwriters propose to make a
public offering of their respective portions of the Shares as soon as you deem
advisable after the registration statement hereinafter referred to becomes
effective, if it has not yet become effective, and the Pricing Agreement
hereinafter defined has been executed and delivered.


      Prior to the purchase and public offering of the Shares by the several
Underwriters, the Company and the Representative, acting on behalf of the
several Underwriters, shall enter into an agreement substantially in the form of
Exhibit A hereto ("Pricing Agreement"). The Pricing Agreement may take the form
of an exchange of any standard form of written telecommunication between the
Company and the Representatives and shall specify such applicable information as
is indicated in Exhibit A hereto. The offering of the Shares


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(1)  Plus an option to acquire up to 833,333 additional shares to cover
     overallotments.


will be governed by this Agreement, as supplemented by the Pricing Agreement.
From and after the date of the execution and delivery of the Pricing Agreement,
this Agreement shall be deemed to incorporate the Pricing Agreement.

      The Company hereby confirms its agreements with the Underwriters as
follows:

       SECTION 2. Representations and Warranties of the Company. The Company
represents and warrants to the several Underwriters that:

            (a) A registration statement on Form S-1 (File No. 333-86390) and a
      related preliminary prospectus with respect to the Shares have been
      prepared and filed with the Securities and Exchange Commission
      ("Commission") by the Company in conformity with the requirements of the
      Securities Act of 1933, as amended, and the rules and regulations of the
      Commission thereunder (collectively, the "1933 Act;" unless indicated to
      the contrary, all references herein to specific rules are rules
      promulgated under the 1933 Act); and the Company has so prepared and has
      filed such amendments thereto, if any, and such amended preliminary
      prospectuses as may have been required to the date hereof and will file
      such additional amendments thereto and such amended prospectuses as may
      hereafter be required. There have been or will promptly be delivered to
      you three signed copies of such registration statement and amendments,
      three copies of each exhibit filed therewith, and conformed copies of such
      registration statement and amendments (but without exhibits) and of the
      related preliminary prospectus or prospectuses and final forms of
      prospectus for each of the Underwriters.

                  Such registration statement (as amended, if applicable) at the
      time it becomes effective and the prospectus constituting a part thereof
      (including the information, if any, deemed to be part thereof pursuant to
      Rule 430A(b) and/or Rule 434), as from time to time amended or
      supplemented, are hereinafter referred to as the "Registration Statement,"
      and the "Prospectus," respectively, except that if any revised prospectus
      shall be provided to the Underwriters by the Company for use in connection
      with the offering of the Shares which differs from the Prospectus on file
      at the Commission at the time the Registration Statement became or becomes
      effective (whether or not such revised prospectus is required to be filed
      by the Company pursuant to Rule 424(b)), the term Prospectus shall refer
      to such revised prospectus from and after the time it was provided to the
      Underwriters for such use. If the Company elects to rely on Rule 434 of
      the 1933 Act, all references to "Prospectus" shall be deemed to include,
      without limitation, the form of prospectus and the term sheet, taken
      together, provided to the Underwriters by the Company in accordance with
      Rule 434 of the 1933 Act ("Rule 434 Prospectus"). Any registration
      statement (including any amendment or supplement thereto or information
      which is deemed part thereof) filed by the Company under Rule 462(b)
      ("Rule 462(b) Registration Statement") shall be deemed to be part of the
      "Registration Statement" as defined herein, and any prospectus (including
      any amendment or supplement thereto or information which is deemed part
      thereof) included in such registration statement shall be deemed to


                                      -2-

      be part of the "Prospectus", as defined herein, as appropriate. The
      Securities Exchange Act of 1934, as amended, and the rules and regulations
      of the Commission thereunder are hereinafter collectively referred to as
      the "Exchange Act."


            (b) The Commission has not issued any order preventing or suspending
      the use of any preliminary prospectus, and each preliminary prospectus has
      conformed in all material respects with the requirements of the 1933 Act
      and, as of its date, has not included any untrue statement of a material
      fact or omitted to state a material fact necessary to make the statements
      therein not misleading; and when the Registration Statement became or
      becomes effective, and at all times subsequent thereto, up to the First
      Closing Date or the Second Closing Date hereinafter defined, as the case
      may be, the Registration Statement, including the information deemed to be
      part of the Registration Statement at the time of effectiveness pursuant
      to Rule 430A(b), if applicable, and the Prospectus and any amendments or
      supplements thereto, contained or will contain all statements that are
      required to be stated therein in accordance with the 1933 Act and in all
      material respects conformed or will in all material respects conform to
      the requirements of the 1933 Act, and neither the Registration Statement
      nor the Prospectus, nor any amendment or supplement thereto, included or
      will include any untrue statement of a material fact or omitted or will
      omit to state a material fact required to be stated therein or necessary
      to make the statements therein not misleading; provided, however, that the
      Company makes no representation or warranty as to information contained in
      or omitted from any preliminary prospectus, the Registration Statement,
      the Prospectus or any such amendment or supplement in reliance upon and in
      conformity with written information furnished to the Company by or on
      behalf of any Underwriter through the Representative specifically for use
      in the preparation thereof.


            (c) The Company and its subsidiaries have been duly incorporated and
      are validly existing as corporations in good standing under the laws of
      their respective places of incorporation, with corporate power and
      authority to own their properties and conduct their business as described
      in the Prospectus; the Company and each of its subsidiaries are duly
      qualified to do business as foreign corporations under the corporation law
      of, and are in good standing as such in, each jurisdiction in which they
      own or lease substantial properties, have an office, or in which
      substantial business is conducted and such qualification is required
      except in any such case where the failure to so qualify or be in good
      standing would not have a material adverse effect upon the Company and its
      subsidiaries taken as a whole; and no proceeding of which the Company has
      knowledge has been instituted in any such jurisdiction, revoking, limiting
      or curtailing, or seeking to revoke, limit or curtail, such power and
      authority or qualification.

            (d) Except as disclosed in the Registration Statement, the Company
      owns directly or indirectly 100 percent of the issued and outstanding
      capital stock of each of its subsidiaries, free and clear of any claims,
      liens, encumbrances or security interests and all of such capital stock
      has been duly authorized and validly issued and is fully paid and
      nonassessable.


                                      -3-


             (e) The issued and outstanding shares of capital stock of the
      Company as set forth in the Prospectus have been duly authorized and
      validly issued, are fully paid and nonassessable, and conform to the
      description thereof contained in the Prospectus.

            (f) The Shares to be sold by the Company have been duly authorized
      and when issued, delivered and paid for pursuant to this Agreement, will
      be validly issued, fully paid and nonassessable, and will conform to the
      description thereof contained in the Prospectus.

            (g) The making and performance by the Company of this Agreement and
      the Pricing Agreement have been duly authorized by all necessary corporate
      action and will not violate any provision of the Company's charter or
      bylaws and will not result in the breach, or be in contravention, of any
      provision of any agreement, franchise, license, indenture, mortgage, deed
      of trust, or other instrument to which the Company or any subsidiary is a
      party or by which the Company, any subsidiary or the property of any of
      them may be bound or affected, or any order, rule or regulation applicable
      to the Company or any subsidiary of any court or regulatory body,
      administrative agency or other governmental body having jurisdiction over
      the Company or any subsidiary or any of their respective properties, or
      any order of any court or governmental agency or authority entered in any
      proceeding to which the Company or any subsidiary was or is now a party or
      by which it is bound. No consent, approval, authorization or other order
      of any court, regulatory body, administrative agency or other governmental
      body is required for the execution and delivery of this Agreement or the
      Pricing Agreement or the consummation of the transactions contemplated
      herein or therein, except for compliance with the 1933 Act and blue sky
      laws applicable to the public offering of the Shares by the several
      Underwriters and clearance of such offering with the National Association
      of Securities Dealers, Inc. ("NASD"). This Agreement has been duly
      executed and delivered by the Company.

            (h) The accountants who have expressed their opinions with respect
      to certain of the financial statements and schedules included in the
      Registration Statement are independent accountants as required by the 1933
      Act.

            (i) The consolidated financial statements and schedules of the
      Company included in the Registration Statement present fairly the
      consolidated financial position of the Company as of the respective dates
      of such financial statements, and the consolidated results of operations
      and cash flows of the Company for the respective periods covered thereby,
      all in conformity with generally accepted accounting principles
      consistently applied throughout the periods involved, except as disclosed
      in the Prospectus, and the supporting schedules included in the
      Registration Statement present fairly the information required to be
      stated therein. The financial information set forth in the Prospectus
      under "Selected Financial Data" presents fairly on the basis stated in the
      Prospectus, the information set forth therein.


                                      -4-

                  The pro forma financial statements and other pro forma
      information included in the Prospectus present fairly the information
      shown therein, have been prepared in accordance with generally accepted
      accounting principles and the Commission's rules and guidelines with
      respect to pro forma financial statements and other pro forma information,
      have been properly compiled on the pro forma basis described therein, and,
      in the opinion of the Company, the assumptions used in the preparation
      thereof are reasonable and the adjustments used therein are appropriate
      under the circumstances.

            (j) Neither the Company nor any subsidiary is in violation of its
      charter or in default under any consent decree, or in default with respect
      to any material provision of any lease, loan agreement, franchise,
      license, permit or other contract obligation to which it is a party; and
      there does not exist any state of facts which constitutes an event of
      default as defined in such documents or which, with notice or lapse of
      time or both, would constitute such an event of default, in each case,
      except for defaults which neither singly nor in the aggregate are material
      to the Company and its subsidiaries taken as a whole.

            (k) There are no material legal or governmental proceedings pending,
      or to the Company's knowledge, threatened to which the Company or any
      subsidiary is or may be a party or of which material property owned or
      leased by the Company or any subsidiary is or may be the subject, or
      related to environmental or discrimination matters which are not disclosed
      in the Prospectus, or which question the validity of this Agreement or the
      Pricing Agreement or any action taken or to be taken pursuant hereto or
      thereto.

            (l) There are no holders of securities of the Company having rights
      to registration thereof or preemptive rights to purchase Common Stock
      except as disclosed in the Prospectus.

            (m) The Company and each of its subsidiaries have good and
      marketable title to all the properties and assets reflected as owned in
      the financial statements hereinabove described (or elsewhere in the
      Prospectus), subject to no lien, mortgage, pledge, charge or encumbrance
      of any kind except those, if any, reflected in such financial statements
      (or elsewhere in the Prospectus) or which are not material to the Company
      and its subsidiaries taken as a whole. The Company and each of its
      subsidiaries hold their respective leased properties which are material to
      the Company and its subsidiaries taken as a whole under valid and binding
      leases.

            (n) The Company has not taken and will not take, directly or
      indirectly, any action designed to or which has constituted or which might
      reasonably be expected to cause or result, under the Exchange Act or
      otherwise, in stabilization or manipulation of the price of any security
      of the Company to facilitate the sale or resale of the Shares.


                                      -5-

            (o) Subsequent to the respective dates as of which information is
      given in the Registration Statement and Prospectus, and except as
      contemplated by the Prospectus, the Company and its subsidiaries, taken as
      a whole, have not incurred any material liabilities or obligations, direct
      or contingent, nor entered into any material transactions not in the
      ordinary course of business and there has not been any material adverse
      change in their condition (financial or otherwise) or results of
      operations nor any material change in their capital stock, short-term debt
      or long-term debt.

            (p) There is no material document of a character required to be
      described in the Registration Statement or the Prospectus or to be filed
      as an exhibit to the Registration Statement which is not described or
      filed as required.

            (q) The Company together with its subsidiaries owns and possesses
      all right, title and interest in and to, or has duly licensed from third
      parties, all patents, patent rights, trade secrets, inventions, know-how,
      trademarks, trade names, copyrights, service marks and other proprietary
      rights ("Trade Rights") material to the business of the Company and each
      of its subsidiaries taken as a whole. Neither the Company nor any of its
      subsidiaries has received any notice of infringement, misappropriation or
      conflict from any third party as to such material Trade Rights which has
      not been resolved or disposed of and neither the Company nor any of its
      subsidiaries has infringed, misappropriated or otherwise conflicted with
      material Trade Rights of any third parties, which infringement,
      misappropriation or conflict would have a material adverse effect upon the
      condition (financial or otherwise) or results of operations of the Company
      and its subsidiaries taken as a whole.

            (r) The conduct of the business of the Company and each of its
      subsidiaries is in compliance in all respects with applicable federal,
      state, local and foreign laws and regulations, except where the failure to
      be in compliance would not have a material adverse effect upon the
      condition (financial or otherwise) or results of operations of the Company
      and its subsidiaries taken as a whole.

            (s) All offers and sales of the Company's capital stock prior to the
      date hereof were at all relevant times exempt from the registration
      requirements of the 1933 Act and were duly registered with or the subject
      of an available exemption from the registration requirements of the
      applicable state securities or blue sky laws.

            (t) The Company has filed all necessary federal and state income and
      franchise tax returns and has paid all taxes shown as due thereon, and
      there is no tax deficiency that has been, or to the knowledge of the
      Company might be, asserted against the Company or any of its properties or
      assets that would or could be expected to have a material adverse affect
      upon the condition (financial or otherwise) or results of operations of
      the Company and its subsidiaries taken as a whole.

            (u) The Company has filed a registration statement pursuant to
      Section 12(g) of the Exchange Act to register the Common Stock thereunder,
      has filed an application to list the Shares on


                                      -6-

      the Nasdaq National Market, and has received notification that the listing
      has been approved, subject to notice of issuance or sale of the Shares, as
      the case may be.

            (v) Each share of Common Stock, when issued, will have associated
      therewith a validly issued Series D Preferred Stock purchase right issued
      pursuant to the Rights Agreement dated ________ between the Company and
      American Stock Transfer and Trust Company as Rights Agent.

            (w) The Company is not, and does not intend to conduct its business
      in a manner in which it would become, an "investment company" as defined
      in Section 3(a) of the Investment Company Act of 1940, as amended
      ("Investment Company Act").


       SECTION 3. Representations and Warranties of the Underwriters. The
Representative, on behalf of the several Underwriters, represent and warrant to
the Company that the information set forth (a) on the cover page of the
Prospectus with respect to price, underwriting discount and terms of the
offering and (b) in all paragraphs under "Underwriting" in the Prospectus,
except paragraph 11, was furnished to the Company by and on behalf of the
Underwriters for use in connection with the preparation of the Registration
Statement and is correct and complete in all material respects.


       SECTION 4. Purchase, Sale and Delivery of Shares. On the basis of the
representations, warranties and agreements herein contained, but subject to the
terms and conditions herein set forth, the Company agrees to sell to the
Underwriters named in Schedule A hereto, and the Underwriters agree, severally
and not jointly, to purchase the Firm Shares from the Company. The obligation of
each Underwriter to the Company shall be to purchase from the Company the number
of Shares set forth opposite the name of such Underwriter in Schedule A hereto.
The initial public offering price and the purchase price shall be set forth in
the Pricing Agreement.


      At 9:00 A.M., Chicago Time, on the fourth business day, if permitted under
Rule 15c6-1 under the Exchange Act, (or the third business day if required under
Rule 15c6-1 under the Exchange Act or unless postponed in accordance with the
provisions of Section 11) following the date the Registration Statement becomes
effective (or, if the Company has elected to rely upon Rule 430A, the fourth
business day, if permitted under Rule 15c6-1 under the Exchange Act, (or the
third business day if required under Rule 15c6-1 under the Exchange Act) after
execution of the Pricing Agreement), or such other time not later than ten
business days after such date as shall be agreed upon by the Representative and
the Company, the Company will deliver to you at the offices of counsel for the
Underwriters or through the facilities of The Depository Trust Company for the
accounts of the several Underwriters, certificates representing the Firm Shares
to be sold by it, against payment of the purchase price therefor by delivery of
federal or other immediately available funds, by wire transfer or otherwise, to
the Company. Such time of delivery and payment is herein referred to as the
"First Closing Date." The certificates for the Firm Shares so to be delivered
will be in such denominations and registered in such names as you request by
notice to the Company prior to 10:00 A.M., Chicago Time, on the second business
day preceding the First Closing Date, and will be made available at the



                                      -7-


Company's expense for checking and packaging by the Representative at 10:00
A.M., Chicago Time, on the business day preceding the First Closing Date.
Payment for the Firm Shares so to be delivered shall be made at the time and in
the manner described above at the offices of counsel for the Underwriters.



      In addition, on the basis of the representations, warranties and
agreements herein contained, but subject to the terms and conditions herein set
forth, the Company hereby grants an option to the several Underwriters to
purchase, severally and not jointly, up to an aggregate of 833,333 Option
Shares, at the same purchase price per share to be paid for the Firm Shares, for
use solely in covering any overallotments made by the Underwriters in the sale
and distribution of the Firm Shares. The option granted hereunder may be
exercised at any time (but not more than once) within 30 days after the date of
the initial public offering upon notice by you to the Company setting forth the
aggregate number of Option Shares as to which the Underwriters are exercising
the option, the names and denominations in which the certificates for such
shares are to be registered and the time and place at which such certificates
will be delivered. Such time of delivery (which may not be earlier than the
First Closing Date), being herein referred to as the "Second Closing Date,"
shall be determined by you, but if at any time other than the First Closing
Date, shall not be earlier than three nor later than 10 full business days after
delivery of such notice of exercise. The number of Option Shares to be purchased
by each Underwriter shall be determined by multiplying the number of Option
Shares to be sold by the Company pursuant to such notice of exercise by a
fraction, the numerator of which is the number of Firm Shares to be purchased by
such Underwriter as set forth opposite its name in Schedule A and the
denominator of which is the total number of Firm Shares (subject to such
adjustments to eliminate any fractional share purchases as you in your absolute
discretion may make). Certificates for the Option Shares will be made available
at the Company's expense for checking and packaging at 10:00 A.M., Chicago Time,
on the business day preceding the Second Closing Date. The manner of payment for
and delivery of the Option Shares shall be the same as for the Firm Shares as
specified in the preceding paragraph.



      You have advised the Company that each Underwriter has authorized you to
accept delivery of its Shares, to make payment and to receipt therefor. You,
individually and not as the Representative of the Underwriters, may make
payment for any Shares to be purchased by any Underwriter whose funds shall not
have been received by you by the First Closing Date or the Second Closing Date,
as the case may be, for the account of such Underwriter, but any such payment
shall not relieve such Underwriter from any obligation hereunder.


      SECTION 5. Covenants of the Company. The Company covenants and agrees
that:


            (a) The Company will advise you promptly of the issuance by the
      Commission of any stop order suspending the effectiveness of the
      Registration Statement or of the institution of any proceedings for that
      purpose, or of any notification of the suspension of qualification of the
      Shares for sale in any jurisdiction or the initiation or threatening of
      any proceedings for that purpose, and will also advise you promptly of any
      request of the Commission for amendment or supplement of the


                                      -8-

      Registration Statement, of any preliminary prospectus or of the
      Prospectus, or for additional information.

            (b) The Company will give you notice of its intention to file or
      prepare any amendment to the Registration Statement (including any
      post-effective amendment) or any Rule 462(b) Registration Statement or any
      amendment or supplement to the Prospectus (including any revised
      prospectus which the Company proposes for use by the Underwriters in
      connection with the offering of the Shares which differs from the
      prospectus on file at the Commission at the time the Registration
      Statement became or becomes effective, whether or not such revised
      prospectus is required to be filed pursuant to Rule 424(b) and any term
      sheet as contemplated by Rule 434) and will furnish you with copies of any
      such amendment or supplement a reasonable amount of time prior to such
      proposed filing or use, as the case may be, and will not file any such
      amendment or supplement or use any such prospectus to which you or counsel
      for the Underwriters shall reasonably object.

            (c) If the Company elects to rely on Rule 434 of the 1933 Act, the
      Company will prepare a term sheet that complies with the requirements of
      Rule 434. If the Company elects not to rely on Rule 434, the Company will
      provide the Underwriters with copies of the form of prospectus, in such
      numbers as the Underwriters may reasonably request, and file with the
      Commission such prospectus in accordance with Rule 424(b) of the 1933 Act
      by the close of business in New York City on the second business day
      immediately succeeding the date of the Pricing Agreement. If the Company
      elects to rely on Rule 434, the Company will provide the Underwriters with
      copies of the form of Rule 434 Prospectus, in such numbers as the
      Underwriters may reasonably request, by the close of business in New York
      on the business day immediately succeeding the date of the Pricing
      Agreement.

            (d) If at any time when a prospectus relating to the Shares is
      required to be delivered under the 1933 Act any event occurs as a result
      of which the Prospectus, including any amendments or supplements, would
      include an untrue statement of a material fact, or omit to state any
      material fact required to be stated therein or necessary to make the
      statements therein, in the light of the circumstances under which they
      were made, not misleading, or if it is necessary at any time to amend the
      Prospectus, including any amendments or supplements thereto and including
      any revised prospectus which the Company proposes for use by the
      Underwriters in connection with the offering of the Shares which differs
      from the prospectus on file with the Commission at the time of
      effectiveness of the Registration Statement, whether or not such revised
      prospectus is required to be filed pursuant to Rule 424(b) to comply with
      the 1933 Act, the Company promptly will advise you thereof and will
      promptly prepare and file with the Commission an amendment or supplement
      which will correct such statement or omission or an amendment which will
      effect such compliance; and, in case any Underwriter is required to
      deliver a prospectus nine months or more after the effective date of the
      Registration Statement, the Company upon request, but at the expense of
      such Underwriter, will


                                      -9-

      prepare promptly such prospectus or prospectuses as may be necessary to
      permit compliance with the requirements of Section 10(a)(3) of the 1933
      Act.

            (e) Neither the Company nor any of its subsidiaries will, prior to
      the earlier of the Second Closing Date or termination or expiration of the
      related option, incur any liability or obligation, direct or contingent,
      or enter into any material transaction, other than in the ordinary course
      of business, except as contemplated by the Prospectus.

            (f) Neither the Company nor any of its subsidiaries will acquire any
      capital stock of the Company prior to the earlier of the Second Closing
      Date or termination or expiration of the related option nor will the
      Company declare or pay any dividend or make any other distribution upon
      the Common Stock payable to stockholders of record on a date prior to the
      earlier of the Second Closing Date or termination or expiration of the
      related option, except in either case as contemplated by the Prospectus.

            (g) Not later than March 31, 2004, the Company will make generally
      available to its security holders an earnings statement (which need not be
      audited) covering a period of at least 12 months beginning after the
      effective date of the Registration Statement, which will satisfy the
      provisions of the last paragraph of Section 11(a) of the 1933 Act.

            (h) During such period as a prospectus is required by law to be
      delivered in connection with offers and sales of the Shares by an
      Underwriter or dealer, the Company will furnish to you at its expense,
      subject to the provisions of subsection (d) hereof, copies of the
      Registration Statement, the Prospectus, each preliminary prospectus and
      all amendments and supplements to any such documents in each case as soon
      as available and in such quantities as you may reasonably request, for the
      purposes contemplated by the 1933 Act.

            (i) The Company will cooperate with the Underwriters in qualifying
      or registering the Shares for sale under the blue sky laws of such
      jurisdictions as you designate, and will continue such qualifications in
      effect so long as reasonably required for the distribution of the Shares.
      The Company shall not be required to qualify as a foreign corporation or
      to file a general consent to service of process in any such jurisdiction
      where it is not currently qualified or where it would be subject to
      taxation as a foreign corporation.

            (j) During the period of five years hereafter, the Company will
      furnish you and each of the other Underwriters with a copy (i) as soon as
      practicable after the filing thereof, of each report filed by the Company
      with the Commission, any securities exchange or the NASD; (ii) as soon as
      practicable after the release thereof, of each material press release in
      respect of the Company; and (iii) as soon as available, of each report of
      the Company mailed to stockholders.


                                      -10-

            (k) The Company will use the net proceeds received by it from the
      sale of the Shares being sold by it in the manner specified in the
      Prospectus.

            (l) If, at the time of effectiveness of the Registration Statement,
      any information shall have been omitted therefrom in reliance upon Rule
      430A and/or Rule 434, then immediately following the execution of the
      Pricing Agreement, the Company will prepare, and file or transmit for
      filing with the Commission in accordance with such Rule 430A, Rule 424(b)
      and/or Rule 434, copies of an amended Prospectus, or, if required by such
      Rule 430A and/or Rule 434, a post-effective amendment to the Registration
      Statement (including an amended Prospectus), containing all information so
      omitted. If required, the Company will prepare and file, or transmit for
      filing, a Rule 462(b) Registration Statement not later than the date of
      the execution of the Pricing Agreement. If a Rule 462(b) Registration
      Statement is filed, the Company shall make payment of, or arrange for
      payment of, the additional registration fee owing to the Commission
      required by Rule 111.

             (m)The Company will comply with all registration, filing and
      reporting requirements of the Exchange Act and the Nasdaq National Market
      and will file with the Commission in a timely manner all reports on Form
      SR required by Rule 463 and will furnish you copies of any such reports as
      soon as practicable after the filing thereof.

             (n)The Company agrees not to offer, sell, contract to sell, pledge
      or otherwise dispose of, directly or indirectly, or file with the
      Commission a registration statement (other than the Registration
      Statement) under the 1933 Act relating to any Common Stock or securities
      convertible into Common Stock (except Common Stock issued pursuant to
      currently outstanding options, warrants or convertible securities) or
      publicly disclose the intention to make any such offer, sale, pledge,
      disposition or filing for a period of 180 days after this Agreement
      becomes effective without the prior written consent of William Blair &
      Company, L.L.C.

       SECTION 6. Payment of Expenses. Whether or not the transactions
contemplated hereunder are consummated or this Agreement becomes effective as to
all of its provisions or is terminated, the Company agrees to pay (i) all costs,
fees and expenses (other than legal fees and disbursements of counsel for the
Underwriters and the expenses incurred by the Underwriters) incurred in
connection with the performance of the Company's obligations hereunder,
including without limiting the generality of the foregoing, all fees and
expenses of legal counsel for the Company and of the Company's independent
accountants, all costs and expenses incurred in connection with the preparation,
printing, filing and distribution of the Registration Statement, each
preliminary prospectus and the Prospectus (including all exhibits and financial
statements) and all amendments and supplements provided for herein, this
Agreement, the Pricing Agreement and the Blue Sky Memorandum, (ii) all costs,
fees and expenses (including legal fees and disbursements of counsel for the
Underwriters) incurred by the Underwriters in connection with qualifying or
registering all or any part of the Shares for offer and sale under blue sky
laws, including the preparation of a blue sky memorandum relating to the Shares
and clearance of such offering with the NASD; and (iii) all fees and expenses of
the Company's


                                      -11-

transfer agent, printing of the certificates for the Shares and all transfer
taxes, if any, with respect to the sale and delivery of the Shares to the
several Underwriters.

       SECTION 7. Conditions of the Obligations of the Underwriters. The
obligations of the several Underwriters to purchase and pay for the Firm Shares
on the First Closing Date and the Option Shares on the Second Closing Date shall
be subject to the accuracy of the representations and warranties on the part of
the Company herein set forth as of the date hereof and as of the First Closing
Date or the Second Closing Date, as the case may be, to the accuracy of the
statements of officers of the Company made pursuant to the provisions hereof, to
the performance by the Company of its obligations hereunder, and to the
following additional conditions:

            (a) The Registration Statement shall have become effective either
      prior to the execution of this Agreement or not later than 1:00 P.M.,
      Chicago Time, on the first full business day after the date of this
      Agreement, or such later time as shall have been consented to by you but
      in no event later than 1:00 P.M., Chicago Time, on the third full business
      day following the date hereof; and prior to the First Closing Date or the
      Second Closing Date, as the case may be, no stop order suspending the
      effectiveness of the Registration Statement shall have been issued and no
      proceedings for that purpose shall have been instituted or shall be
      pending or, to the knowledge of the Company or you, shall be contemplated
      by the Commission. If the Company has elected to rely upon Rule 430A
      and/or Rule 434, the information concerning the initial public offering
      price of the Shares and price-related information shall have been
      transmitted to the Commission for filing pursuant to Rule 424(b) within
      the prescribed period and the Company will provide evidence satisfactory
      to the Representatives of such timely filing (or a post-effective
      amendment providing such information shall have been filed and declared
      effective in accordance with the requirements of Rules 430A and 424(b)).
      If a Rule 462(b) Registration Statement is required, such Registration
      Statement shall have been transmitted to the Commission for filing and
      become effective within the prescribed time period and, prior to the First
      Closing Date, the Company shall have provided evidence of such filing and
      effectiveness in accordance with Rule 462(b).


            (b) The Shares shall have been qualified for sale under the blue sky
      laws of such states as shall have been specified by the Representative.


            (c) The legality and sufficiency of the authorization, issuance and
      sale or transfer and sale of the Shares hereunder, the validity and form
      of the certificates representing the Shares, the execution and delivery of
      this Agreement and the Pricing Agreement, and all corporate proceedings
      and other legal matters incident thereto, and the form of the Registration
      Statement and the Prospectus (except financial statements) shall have been
      approved by counsel for the Underwriters exercising reasonable judgment.


                                      -12-

            (d) You shall not have advised the Company that the Registration
      Statement or the Prospectus or any amendment or supplement thereto,
      contains an untrue statement of fact, which, in the opinion of counsel for
      the Underwriters, is material or omits to state a fact which, in the
      opinion of such counsel, is material and is required to be stated therein
      or necessary to make the statements therein not misleading.

            (e) Subsequent to the execution and delivery of this Agreement,
      there shall not have occurred any change, or any development involving a
      prospective change, in or affecting particularly the business or
      properties of the Company or its subsidiaries, whether or not arising in
      the ordinary course of business, which, in the judgment of the
      Representatives, makes it impractical or inadvisable to proceed with the
      public offering or purchase of the Shares as contemplated hereby.


            (f) There shall have been furnished to you, as Representative of
      the Underwriters, on the First Closing Date or the Second Closing Date, as
      the case may be, except as otherwise expressly provided below:


                  (i) An opinion of Cadwalader, Wickersham & Taft, counsel for
            the Company, addressed to the Underwriters and dated the First
            Closing Date or the Second Closing Date, as the case may be, to the
            effect that:

                        (1) the Company has been duly incorporated and is
                  validly existing as a corporation in good standing under the
                  laws of the State of Delaware with corporate power and
                  authority to own its properties and conduct its business as
                  described in the Prospectus; and the Company has been duly
                  qualified to do business as a foreign corporation under the
                  corporation law of, and is in good standing as such in, every
                  jurisdiction where the ownership or leasing of property, or
                  the conduct of its business requires such qualification except
                  where the failure so to qualify would not have a material
                  adverse effect upon the condition (financial or otherwise) or
                  results of operations of the Company and its subsidiaries
                  taken as a whole;

                        (2) an opinion to the same general effect as clause (1)
                  of this subparagraph (i) in respect of each direct and
                  indirect subsidiary of the Company;

                        (3) all of the issued and outstanding capital stock of
                  each subsidiary of the Company has been duly authorized,
                  validly issued and is fully paid and nonassessable, and,
                  except as disclosed in the Registration Statement, the Company
                  owns directly or indirectly 100 percent of the outstanding
                  capital stock of each subsidiary, and to the best knowledge of
                  such counsel, such stock is owned free and clear of any
                  claims, liens, encumbrances or security interests;


                                      -13-

(
)                        (4) the authorized capital stock of the Company, of
                  which there is outstanding the amount set forth in the
                  Registration Statement and Prospectus (except for subsequent
                  issuances, if any, pursuant to stock options or other rights
                  referred to in the Prospectus), conforms as to legal matters
                  in all material respects to the description thereof in the
                  Registration Statement and Prospectus;

                        (5) the issued and outstanding capital stock of the
                  Company has been duly authorized and validly issued and is
                  fully paid and nonassessable;

                        (6) the certificates for the Shares to be delivered
                  hereunder are in due and proper form, and when duly
                  countersigned by the Company's transfer agent and delivered to
                  you or upon your order against payment of the agreed
                  consideration therefor in accordance with the provisions of
                  this Agreement and the Pricing Agreement, the Shares
                  represented thereby will be duly authorized and validly
                  issued, fully paid and nonassessable;

                        (7) the Registration Statement has become effective
                  under the 1933 Act, and, to the best knowledge of such
                  counsel, no stop order suspending the effectiveness of the
                  Registration Statement has been issued and no proceedings for
                  that purpose have been instituted or are pending or
                  contemplated under the 1933 Act, and the Registration
                  Statement (including the information deemed to be part of the
                  Registration Statement at the time of effectiveness pursuant
                  to Rule 430A(b) and/or Rule 434, if applicable), the
                  Prospectus and each amendment or supplement thereto (except
                  for the financial statements and other statistical or
                  financial data included therein as to which such counsel need
                  express no opinion) comply as to form in all material respects
                  with the requirements of the 1933 Act; such counsel have no
                  reason to believe that either the Registration Statement
                  (including the information deemed to be part of the
                  Registration Statement at the time of effectiveness pursuant
                  to Rule 430A(b) and/or Rule 434, if applicable) or the
                  Prospectus, or the Registration Statement or the Prospectus as
                  amended or supplemented (except as aforesaid), as of their
                  respective effective or issue dates, contained any untrue
                  statement of a material fact or omitted to state a material
                  fact required to be stated therein or necessary to make the
                  statements therein not misleading or that the Prospectus as
                  amended or supplemented, if applicable, as of the First
                  Closing Date or the Second Closing Date, as the case may be,
                  contained any untrue statement of a material fact or omitted
                  to state any material fact necessary to make the statements
                  therein not misleading in light of the circumstances under
                  which they were made; the statements in the Registration
                  Statement and the Prospectus summarizing statutes, rules and
                  regulations are accurate and fairly and correctly present the
                  information required to be presented by the 1933 Act or the
                  rules and regulations thereunder, in all material


                                      -14-

                  respects and such counsel does not know of any statutes, rules
                  and regulations required to be described or referred to in the
                  Registration Statement or the Prospectus that are not
                  described or referred to therein as required; and such counsel
                  does not know of any legal or governmental proceedings pending
                  or threatened required to be described in the Prospectus which
                  are not described as required, nor of any contracts or
                  documents of a character required to be described in the
                  Registration Statement or Prospectus or to be filed as
                  exhibits to the Registration Statement which are not described
                  or filed, as required;

                        (8) the statements under the captions "Management -
                  Amended and Restated Cosi, Inc. Stock Incentive Plan,"
                  "Management - 1999 Cosi Sandwich Bar, Inc. Incentive Stock
                  Option Plan," "Management - Cosi Non-Employee Director Stock
                  Option Plan," "Management - Employee Stock Purchase Plan,"
                  "Related Party Transactions," "Description of Capital Stock"
                  and "Shares Eligible for Future Sale" in the Prospectus,
                  insofar as such statements constitute a summary of documents
                  referred to therein or matters of law, are accurate summaries
                  and fairly and correctly present, in all material respects,
                  the information called for with respect to such documents and
                  matters;

                        (9) this Agreement and the Pricing Agreement and the
                  performance of the Company's obligations hereunder have been
                  duly authorized by all necessary corporate action and this
                  Agreement and the Pricing Agreement have been duly executed
                  and delivered by and on behalf of the Company, and are legal,
                  valid and binding agreements of the Company, except as
                  enforceability of the same may be limited by bankruptcy,
                  insolvency, reorganization, moratorium or other similar laws
                  affecting creditors' rights and by the exercise of judicial
                  discretion in accordance with general principles applicable to
                  equitable and similar remedies and except as to those
                  provisions relating to indemnities for liabilities arising
                  under the 1933 Act as to which no opinion need be expressed;
                  and no approval, authorization or consent of any public board,
                  agency, or instrumentality of the United States or of any
                  state or other jurisdiction is necessary in connection with
                  the issue or sale of the Shares by the Company pursuant to
                  this Agreement (other than under the 1933 Act, applicable blue
                  sky laws and the rules of the NASD) or the consummation by the
                  Company of any other transactions contemplated hereby;

                       (10) the execution and performance of this Agreement will
                  not contravene any of the provisions of, or result in a
                  default under, any agreement, franchise, license, indenture,
                  mortgage, deed of trust, or other instrument known to such
                  counsel, of the Company or any of its subsidiaries or by which
                  the property of any of them is bound and which contravention
                  or default would be material to the


                                      -15-

                  Company and its subsidiaries taken as a whole; or violate any
                  of the provisions of the charter or bylaws of the Company or
                  any of its subsidiaries or, so far as is known to such
                  counsel, violate any statute, order, rule or regulation of any
                  regulatory or governmental body having jurisdiction over the
                  Company or any of its subsidiaries;

                       (11) each share of Common Stock, when issued, will have
                  associated therewith a validly issued Series D Preferred Stock
                  purchase right issued pursuant to the Rights Agreement dated
                  ________ between the Company and American Stock Transfer and
                  Trust Company as Rights Agent;

                       (12) the Company is not an "investment company" or a
                  person "controlled by" an "investment company" within the
                  meaning of the Investment Company Act.

                        In rendering such opinion, such counsel may state that
            they are relying upon the certificate of American Stock Transfer and
            Trust Company, the transfer agent for the Common Stock, as to the
            number of shares of Common Stock at any time or times outstanding,
            and that insofar as their opinion under clause (7) above relates to
            the accuracy and completeness of the Prospectus and Registration
            Statement, it is based upon a general review with the Company's
            representatives and independent accountants of the information
            contained therein, without independent verification by such counsel
            of the accuracy or completeness of such information. Such counsel
            may also rely upon the opinions of other competent counsel and, as
            to factual matters, on certificates of officers of the Company and
            of state officials, in which case their opinion is to state that
            they are so doing and copies of said opinions or certificates are to
            be attached to the opinion unless said opinions or certificates (or,
            in the case of certificates, the information therein) have been
            furnished to the Representatives in other form.

                 (ii) Such opinion or opinions of Sidley Austin Brown & Wood,
            counsel for the Underwriters, dated the First Closing Date or the
            Second Closing Date, as the case may be, with respect to the
            incorporation of the Company, the validity of the Shares to be sold
            by the Company, the Registration Statement and the Prospectus and
            other related matters as you may reasonably require, and the Company
            shall have furnished to such counsel such documents and shall have
            exhibited to them such papers and records as they request for the
            purpose of enabling them to pass upon such matters.

                (iii) A certificate of the chief executive officer and the
            principal financial officer of the Company, dated the First Closing
            Date or the Second Closing Date, as the case may be, to the effect
            that:


                                      -16-

                        (1) the representations and warranties of the Company
                  set forth in Section 2 of this Agreement are true and correct
                  as of the date of this Agreement and as of the First Closing
                  Date or the Second Closing Date, as the case may be, and the
                  Company has complied with all the agreements and satisfied all
                  the conditions on its part to be performed or satisfied at or
                  prior to such Closing Date; and

                        (2) the Commission has not issued an order preventing or
                  suspending the use of the Prospectus or any preliminary
                  prospectus filed as a part of the Registration Statement or
                  any amendment thereto; no stop order suspending the
                  effectiveness of the Registration Statement has been issued;
                  and to the best knowledge of the respective signers, no
                  proceedings for that purpose have been instituted or are
                  pending or contemplated under the 1933 Act.

                        The delivery of the certificate provided for in this
            subparagraph shall be and constitute a representation and warranty
            of the Company as to the facts required in the immediately foregoing
            clauses (1) and (2) of this subparagraph to be set forth in said
            certificate.

                 (iv) At the time the Pricing Agreement is executed and also on
            the First Closing Date or the Second Closing Date, as the case may
            be, there shall be delivered to you a letter addressed to you, as
            Representatives of the Underwriters, from Ernst & Young, L.L.P.,
            independent accountants, the first one to be dated the date of the
            Pricing Agreement, the second one to be dated the First Closing Date
            and the third one (in the event of a second closing) to be dated the
            Second Closing Date, to the effect set forth in Schedule C. There
            shall not have been any change or decrease specified in the letters
            referred to in this subparagraph which makes it impractical or
            inadvisable in the judgment of the Representatives to proceed with
            the public offering or purchase of the Shares as contemplated
            hereby.

                  (v) A certificate of the chief executive officer and the
            principal financial officer of the Company, dated the First Closing
            Date or the Second Closing Date, as the case may be, verifying the
            truth and accuracy of any statistical or financial figure included
            in the Prospectus which has not been otherwise verified by the
            letters referred to in clause (iv) above, such verification to
            include the provision of documentary evidence supporting any such
            statistical or financial figure.

                  (vi) Such further certificates and documents as you may
            reasonably request.


      All such opinions, certificates, letters and documents shall be in
compliance with the provisions hereof only if they are satisfactory to you and
to Sidley Austin Brown & Wood, counsel for the Underwriters,


                                      -17-

which approval shall not be unreasonably withheld. The Company shall furnish you
with such manually signed or conformed copies of such opinions, certificates,
letters and documents as you request.

      If any condition to the Underwriters' obligations hereunder to be
satisfied prior to or at the First Closing Date is not so satisfied, this
Agreement at your election will terminate upon notification to the Company
without liability on the part of any Underwriter or the Company, except for the
expenses to be paid or reimbursed by the Company pursuant to Sections 6 and 8
hereof and except to the extent provided in Section 10 hereof.

       SECTION 8. Reimbursement of Underwriters' Expenses. If the sale to the
Underwriters of the Shares on the First Closing Date is not consummated because
any condition of the Underwriters' obligations hereunder is not satisfied or
because of any refusal, inability or failure on the part of the Company to
perform any agreement herein or to comply with any provision hereof, unless such
failure to satisfy such condition or to comply with any provision hereof is due
to the default or omission of any Underwriter, the Company agrees to reimburse
you and the other Underwriters upon demand for all out-of-pocket expenses
(including reasonable fees and disbursements of counsel) that shall have been
reasonably incurred by you and them in connection with the proposed purchase and
the sale of the Shares. Any such termination shall be without liability of any
party to any other party except that the provisions of this Section, Section 6
and Section 10 shall at all times be effective and shall apply.

       SECTION 9. Effectiveness of Registration Statement. You and the Company
will use your and its best efforts to cause the Registration Statement to become
effective, if it has not yet become effective, and to prevent the issuance of
any stop order suspending the effectiveness of the Registration Statement and,
if such stop order be issued, to obtain as soon as possible the lifting thereof.

      SECTION 10. Indemnification. (a) The Company agrees to indemnify and hold
harmless each Underwriter and each person, if any, who controls any Underwriter
within the meaning of the 1933 Act or the Exchange Act against any losses,
claims, damages or liabilities, joint or several, to which such Underwriter or
such controlling person may become subject under the 1933 Act, the Exchange Act
or other federal or state statutory law or regulation, at common law or
otherwise (including in settlement of any litigation if such settlement is
effected with the written consent of the Company), insofar as such losses,
claims, damages or liabilities (or actions in respect thereof) arise out of or
are based upon any untrue statement or alleged untrue statement of any material
fact contained in the Registration Statement, including the information deemed
to be part of the Registration Statement at the time of effectiveness pursuant
to Rule 430A and/or Rule 434, if applicable, any preliminary prospectus, the
Prospectus, or any amendment or supplement thereto, or arise out of or are based
upon the omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading;
and will reimburse each Underwriter and each such controlling person for any
legal or other expenses reasonably incurred by such Underwriter or such
controlling person in connection with investigating or defending any such loss,
claim, damage, liability or action; provided, however, that the Company will not
be liable in any such case to the extent that (i) any such


                                      -18-

loss, claim, damage or liability arises out of or is based upon an untrue
statement or alleged untrue statement or omission or alleged omission made in
the Registration Statement, any preliminary prospectus, the Prospectus or any
amendment or supplement thereto in reliance upon and in conformity with
information described in Section 3 of this Agreement furnished to the Company by
or on behalf of any Underwriter through the Representatives; or (ii) if such
statement or omission was contained or made in any preliminary prospectus and
corrected in the Prospectus and (1) any such loss, claim, damage or liability
suffered or incurred by any Underwriter (or any person who controls any
Underwriter) resulted from an action, claim or suit by any person who purchased
Shares which are the subject thereof from such Underwriter in the offering and
(2) such Underwriter failed to deliver or provide a copy of the Prospectus to
such person at or prior to the confirmation of the sale of such Shares in any
case where such delivery is required by the 1933 Act. In addition to its other
obligations under this Section 10(a), the Company agrees that, as an interim
measure during the pendency of any claim, action, investigation, inquiry or
other proceeding arising out of or based upon any statement or omission, or any
alleged statement or omission, described in this Section 10(a), it will
reimburse the Underwriters on a monthly basis for all reasonable legal and other
expenses incurred in connection with investigating or defending any such claim,
action, investigation, inquiry or other proceeding, notwithstanding the absence
of a judicial determination as to the propriety and enforceability of the
Company's obligation to reimburse the Underwriters for such expenses and the
possibility that such payments might later be held to have been improper by a
court of competent jurisdiction. This indemnity agreement will be in addition to
any liability which the Company may otherwise have.


      (b) Each Underwriter will severally indemnify and hold harmless the
Company, each of its directors, each of its officers who signed the Registration
Statement, and each person, if any, who controls the Company within the meaning
of the 1933 Act or the Exchange Act, against any losses, claims, damages or
liabilities to which the Company, or any such director, officer or controlling
person may become subject under the 1933 Act, the Exchange Act or other federal
or state statutory law or regulation, at common law or otherwise (including in
settlement of any litigation, if such settlement is effected with the written
consent of such Underwriter), insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue or alleged untrue statement of any material fact contained in the
Registration Statement, any preliminary prospectus, the Prospectus, or any
amendment or supplement thereto, or arise out of or are based upon the omission
or alleged omission to state therein a material fact required to be stated
therein or necessary to make the statements therein not misleading, in each case
to the extent, but only to the extent, that such untrue statement or alleged
untrue statement or omission or alleged omission was made in the Registration
Statement, any preliminary prospectus, the Prospectus, or any amendment or
supplement thereto in reliance upon and in conformity with the information
described in Section 3 of this Agreement furnished to the Company by or on
behalf of such Underwriter through the Representative; and will reimburse any
legal or other expenses reasonably incurred by the Company, or any such
director, officer or controlling person in connection with investigating or
defending any such loss, claim, damage, liability or action. In addition to
their other obligations under this Section 10(b), the Underwriters agree that,
as an interim measure during the pendency of any claim, action, investigation,
inquiry or other proceeding arising out of or based upon any statement or
omission, or any alleged statement or omission, described in this Section 10(b),
they will



                                      -19-

reimburse the Company on a monthly basis for all reasonable legal and other
expenses incurred in connection with investigating or defending any such claim,
action, investigation, inquiry or other proceeding, notwithstanding the absence
of a judicial determination as to the propriety and enforceability of the
Underwriters' obligation to reimburse the Company for such expenses and the
possibility that such payments might later be held to have been improper by a
court of competent jurisdiction. This indemnity agreement will be in addition to
any liability which such Underwriter may otherwise have.


      (c) Promptly after receipt by an indemnified party under this Section of
notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against an indemnifying party under this
Section 10, notify the indemnifying party of the commencement thereof; but the
omission so to notify the indemnifying party will not relieve it from any
liability which it may have to any indemnified party except to the extent that
the indemnifying party was prejudiced by such failure to notify. In case any
such action is brought against any indemnified party, and it notifies an
indemnifying party of the commencement thereof, the indemnifying party will be
entitled to participate in, and, to the extent that it may wish, jointly with
all other indemnifying parties similarly notified, to assume the defense
thereof, with counsel satisfactory to such indemnified party; provided, however,
if the defendants in any such action include both the indemnified party and the
indemnifying party and the indemnified party shall have reasonably concluded
that there may be legal defenses available to it and/or other indemnified
parties which are different from or additional to those available to the
indemnifying party, or the indemnified and indemnifying parties may have
conflicting interests which would make it inappropriate for the same counsel to
represent both of them, the indemnified party or parties shall have the right to
select separate counsel to assume such legal defense and otherwise to
participate in the defense of such action on behalf of such indemnified party or
parties. Upon receipt of notice from the indemnifying party to such indemnified
party of its election so to assume the defense of such action and approval by
the indemnified party of counsel, the indemnifying party will not be liable to
such indemnified party under this Section 10 for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed such counsel in
connection with the assumption of legal defense in accordance with the proviso
to the next preceding sentence (it being understood, however, that the
indemnifying party shall not be liable for the expenses of more than one
separate counsel, approved by the Representative in the case of paragraph (a)
representing all indemnified parties not having different or additional defenses
or potential conflicting interest among themselves who are parties to such
action), (ii) the indemnifying party shall not have employed counsel
satisfactory to the indemnified party to represent the indemnified party within
a reasonable time after notice of commencement of the action or (iii) the
indemnifying party has authorized the employment of counsel for the indemnified
party at the expense of the indemnifying party. No indemnifying party shall,
without the prior written consent of the indemnified party, effect any
settlement of any pending or threatened proceeding in respect of which any
indemnified party is or could have been a party and indemnity could have been
sought hereunder by such indemnified party, unless such settlement includes an
unconditional release of such indemnified party from all liability arising out
of such proceeding.



                                      -20-

      (d) If the indemnification provided for in this Section 10 is unavailable
to an indemnified party under paragraphs (a) or (b) hereof in respect of any
losses, claims, damages or liabilities referred to therein, then each applicable
indemnifying party, in lieu of indemnifying such indemnified party, shall
contribute to the amount paid or payable by such indemnified party as a result
of such losses, claims, damages or liabilities (i) in such proportion as is
appropriate to reflect the relative benefits received by the Company and the
Underwriters from the offering of the Shares or (ii) if the allocation provided
by clause (i) above is not permitted by applicable law, in such proportion as is
appropriate to reflect not only the relative benefits referred to in clause (i)
above but also the relative fault of the Company and the Underwriters in
connection with the statements or omissions which resulted in such losses,
claims, damages or liabilities, as well as any other relevant equitable
considerations. The respective relative benefits received by the Company and the
Underwriters shall be deemed to be in the same proportion in the case of the
Company as the total price paid to the Company for the Shares by the
Underwriters (net of underwriting discount but before deducting expenses), and
in the case of the Underwriters as the underwriting discount received by them
bears to the total of such amounts paid to the Company and received by the
Underwriters as underwriting discount in each case as contemplated by the
Prospectus. The relative fault of the Company and the Underwriters shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission to state a material fact
relates to information supplied by the Company or by the Underwriters and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such statement or omission. The amount paid or payable by a
party as a result of the losses, claims, damages and liabilities referred to
above shall be deemed to include any legal or other fees or expenses reasonably
incurred by such party in connection with investigating or defending any action
or claim.

      The Company and the Underwriters agree that it would not be just and
equitable if contribution pursuant to this Section 10 were determined by pro
rata allocation or by any other method of allocation which does not take account
of the equitable considerations referred to in the immediately preceding
paragraph. Notwithstanding the provisions of this Section 10, no Underwriter
shall be required to contribute any amount in excess of the amount by which the
total price at which the Shares underwritten by it and distributed to the public
were offered to the public exceeds the amount of any damages which such
Underwriter has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the 1933
Act) shall be entitled to contribution from any person who was not guilty of
such fraudulent misrepresentation. The Underwriters' obligations to contribute
pursuant to this Section are several in proportion to their respective
underwriting commitments and not joint.

      (e) The provisions of this Section 10 shall survive any termination of
this Agreement.


      Section 11. Default of Underwriters. It shall be a condition to the
agreement and obligation of the Company to sell and deliver the Shares
hereunder, and of each Underwriter to purchase the Shares hereunder, that,
except as hereinafter in this paragraph provided, each of the Underwriters shall
purchase and pay for all Shares agreed to be purchased by such Underwriter
hereunder upon tender to the Representative of



                                      -21-


all such Shares in accordance with the terms hereof. If any Underwriter or
Underwriters default in their obligations to purchase Shares hereunder on the
First Closing Date and the aggregate number of Shares which such defaulting
Underwriter or Underwriters agreed but failed to purchase does not exceed 10
percent of the total number of Shares which the Underwriters are obligated to
purchase on the First Closing Date, the Representative may make arrangements
satisfactory to the Company for the purchase of such Shares by other persons,
including any of the Underwriters, but if no such arrangements are made by such
date the nondefaulting Underwriters shall be obligated severally, in proportion
to their respective commitments hereunder, to purchase the Shares which such
defaulting Underwriters agreed but failed to purchase on such date. If any
Underwriter or Underwriters so default and the aggregate number of Shares with
respect to which such default or defaults occur is more than the above
percentage and arrangements satisfactory to the Representative and the Company
for the purchase of such Shares by other persons are not made within 36 hours
after such default, this Agreement will terminate without liability on the part
of any nondefaulting Underwriter or the Company, except for the expenses to be
paid by the Company pursuant to Section 6 hereof and except to the extent
provided in Section 10 hereof.


      In the event that Shares to which a default relates are to be purchased by
the nondefaulting Underwriters or by another party or parties, the
Representatives or the Company shall have the right to postpone the First
Closing Date for not more than seven business days in order that the necessary
changes in the Registration Statement, Prospectus and any other documents, as
well as any other arrangements, may be effected. As used in this Agreement, the
term "Underwriter" includes any person substituted for an Underwriter under this
Section. Nothing herein will relieve a defaulting Underwriter from liability for
its default.

      SECTION 12. Effective Date. This Agreement shall become effective
immediately as to Sections 6, 8, 10 and 13 and as to all other provisions at
10:00 A.M., Chicago Time, on the day following the date upon which the Pricing
Agreement is executed and delivered, unless such a day is a Saturday, Sunday or
holiday (and in that event this Agreement shall become effective at such hour on
the business day next succeeding such Saturday, Sunday or holiday); but this
Agreement shall nevertheless become effective at such earlier time after the
Pricing Agreement is executed and delivered as you may determine on and by
notice to the Company or by release of any Shares for sale to the public. For
the purposes of this Section, the Shares shall be deemed to have been so
released upon the release for publication of any newspaper advertisement
relating to the Shares or upon the release by you of telegrams (i) advising
Underwriters that the Shares are released for public offering, or (ii) offering
the Shares for sale to securities dealers, whichever may occur first.

      SECTION 13. Termination. Without limiting the right to terminate this
Agreement pursuant to any other provision hereof:


            (a) This Agreement may be terminated by the Company by notice to you
      or by you by notice to the Company at any time prior to the time this
      Agreement shall become effective as to all its provisions, and any such
      termination shall be without liability on the part of the Company to any


                                      -22-

      Underwriter (except for the expenses to be paid or reimbursed pursuant to
      Section 6 hereof and except to the extent provided in Section 10 hereof)
      or of any Underwriter to the Company.


            (b) This Agreement may also be terminated by you prior to the First
      Closing Date, and the option referred to in Section 4, if exercised, may
      be cancelled at any time prior to the Second Closing Date, if (i) trading
      in securities on the New York Stock Exchange or the Nasdaq National Market
      shall have been suspended or minimum prices shall have been established on
      such exchange or market, or (ii) a banking moratorium shall have been
      declared by Illinois, New York, or United States authorities, or (iii)
      there shall have been any change in financial markets or in political,
      economic or financial conditions which, in the opinion of the
      Representatives, either renders it impracticable or inadvisable to proceed
      with the offering and sale of the Shares on the terms set forth in the
      Prospectus or materially and adversely affects the market for the Shares,
      or (iv) there shall have been an outbreak of major armed hostilities
      between the United States and any foreign power or terrorist organization
      which in the opinion of the Representative makes it impractical or
      inadvisable to offer or sell the Shares. Any termination pursuant to this
      paragraph (b) shall be without liability on the part of any Underwriter to
      the Company or on the part of the Company to any Underwriter (except for
      expenses to be paid or reimbursed pursuant to Section 6 hereof and except
      to the extent provided in Section 10 hereof).


      SECTION 14. Representations and Indemnities to Survive Delivery. The
respective indemnities, agreements, representations, warranties and other
statements of the Company, of its officers, and of the several Underwriters set
forth in or made pursuant to this Agreement will remain in full force and
effect, regardless of any investigation made by or on behalf of any Underwriter
or the Company or any of its or their partners, principals, members, officers or
directors or any controlling person, and will survive delivery of and payment
for the Shares sold hereunder.

      SECTION 15. Notices. All communications hereunder will be in writing and,
if sent to the Underwriters will be mailed, delivered or telegraphed and
confirmed to you c/o William Blair & Company, L.L.C., 222 West Adams Street,
Chicago, Illinois 60606, with a copy to Larry A. Barden c/o Sidley Austin Brown
& Wood, Bank One Plaza, Chicago, Illinois 60603; if sent to the Company will be
mailed, delivered or telegraphed and confirmed to the Company at its corporate
headquarters with a copy to William P. Mills, III c/o Cadwalader, Wickersham &
Taft, 100 Maiden Lane, New York, New York 10038.

      SECTION 16. Successors. This Agreement and the Pricing Agreement will
inure to the benefit of and be binding upon the parties hereto and their
respective successors, personal representatives and assigns, and to the benefit
of the officers and directors and controlling persons referred to in Section 10,
and no other person will have any right or obligation hereunder. The term
"successors" shall not include any purchaser of the Shares as such from any of
the Underwriters merely by reason of such purchase.


                                      -23-

      SECTION 17. Representation of Underwriters. You will act as
Representatives for the several Underwriters in connection with this financing,
and any action under or in respect of this Agreement taken by you will be
binding upon all the Underwriters.

      SECTION 18. Partial Unenforceability. If any section, paragraph or
provision of this Agreement is for any reason determined to be invalid or
unenforceable, such determination shall not affect the validity or
enforceability of any other section, paragraph or provision hereof.

      SECTION 19. Applicable Law. This Agreement and the Pricing Agreement shall
be governed by and construed in accordance with the laws of the State of
Illinois.


      If the foregoing is in accordance with your understanding of our
agreement, kindly sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement among the Company and the several
Underwriters including you, all in accordance with its terms.

                                        Very truly yours,
                                        COSI, INC.

                                        By:
                                           ------------------------------------
                                           Andrew M. Stenzler
                                           Chairman and Chief Executive Officer



The foregoing Agreement is hereby
confirmed and accepted as of the
date first above written.


WILLIAM BLAIR & COMPANY, L.L.C.



Acting as Representative of the
several Underwriters named in Schedule A.


By: William Blair & Company, L.L.C.


By: __________________________________
         Principal


                                      -24-

                                   SCHEDULE A




                                                          Number of
                                                         Firm Shares
Underwriter                                            to be Purchased
- -----------                                            ---------------
                                                    


William Blair & Company, L.L.C.









                                                         --------------
                        TOTAL
                                                         ==============



                                   SCHEDULE B



                                               Number of              Number of
                                              Firm Shares           Option Shares
                                               to be Sold             to be Sold
                                               ----------             ----------
                                                              
Company


                                               ----------             ----------
                        TOTAL
                                               ==========             ==========


                                   SCHEDULE C

                     Comfort Letter of Ernst & Young, L.L.P.

      (1) They are independent public accountants with respect to the Company
and its subsidiaries within the meaning of the 1933 Act.

      (2) In their opinion the consolidated financial statements and financial
statement schedule included in the Registration Statement comply as to form in
all material respects with the applicable accounting requirements of the 1933
Act and the related rules and regulations adopted by the Commission.

      (3) On the basis of specified procedures (but not an examination in
accordance with generally accepted auditing standards), including inquiries of
certain officers of the Company and its subsidiaries responsible for financial
and accounting matters as to transactions and events subsequent to December 31,
2001, a reading of minutes of meetings of the stockholders and directors of the
Company and its subsidiaries since December 31, 2001, a reading of the latest
available interim unaudited consolidated financial statements of the Company and
its subsidiaries (with an indication of the date thereof) and other procedures
as specified in such letter, nothing came to their attention which caused them
to believe that (i) the unaudited consolidated financial statements of the
Company and its subsidiaries included in the Registration Statement do not
comply as to form in all material respects with the applicable accounting
requirements of the 1933 Act and the related rules and regulations adopted by
the Commission or that such unaudited financial statements are not fairly
presented in accordance with generally accepted accounting principles applied on
a basis substantially consistent with that of the audited financial statements
included in the Registration Statement, and (ii) at a specified date not more
than five days prior to the date thereof in the case of the first letter and not
more than two business days prior to the date thereof in the case of the second
and third letters, there was any change in the capital stock or long-term debt
or short-term debt (other than normal payments) of the Company and its
subsidiaries on a consolidated basis or any decrease in consolidated net current
assets or consolidated stockholders' equity as compared with amounts shown on
the latest unaudited balance sheet of the Company included in the Registration
Statement or for the period from the date of such balance sheet to a date not
more than five days prior to the date thereof in the case of the first letter
and not more than two business days prior to the date thereof in the case of the
second and third letters, there were any decreases, as compared with the
corresponding period of the prior year, in consolidated net sales, consolidated
income before extraordinary items or in the total or per share amounts of
consolidated net income except, in all instances, for changes or decreases which
the Prospectus discloses have occurred or may occur or which are set forth in
such letter.


      (4) They have carried out specified procedures, which have been agreed to
by the Representatives, with respect to certain information in the Prospectus
specified by the Representative, and on



                                      -25-

the basis of such procedures, they have found such information to be in
agreement with the general accounting records of the Company and its
subsidiaries.


                                      -28-

                                                                       EXHIBIT A

                                   COSI, INC.


                         5,555,556 Shares Common Stock(2)



- --------


(2)  Plus an option to acquire up to 833,333 additional shares to cover
     overallotments.


                                PRICING AGREEMENT

                                                                _________ , 2002


William Blair & Company, L.L.C.
  As Representative of the Several
  Underwriters
c/o William Blair & Company, L.L.C.
222 West Adams Street
Chicago, Illinois 60606



Ladies and Gentlemen:



      Reference is made to the Underwriting Agreement dated _________________,
2002 (the "Underwriting Agreement") relating to the sale by the Company and the
purchase by the several Underwriters for whom William Blair & Company, L.L.C.
and [Co-Managers] are acting as representative (the "Representative"), of the
above Shares. All terms herein shall have the definitions contained in the
Underwriting Agreement except as otherwise defined herein.


      Pursuant to Section 4 of the Underwriting Agreement, the Company agrees
with the Representatives as follows:

      1. The initial public offering price per share for the Shares shall be
$__________.


       2. The purchase price per share for the Shares to be paid by the several
Underwriters shall be $_____________, being an amount equal to the initial
public offering price set forth above less $____________ per share.

      If the foregoing is in accordance with your understanding of our
agreement, kindly sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement among the Company and the several
Underwriters, including you, all in accordance with its terms.

                                        Very truly yours,

                                        COSI, INC.


                                        By:_____________________________________
                                           Andrew M. Stenzler
                                           Chairman and Chief Executive Officer


                                      -30-

The foregoing Agreement is hereby
confirmed and accepted as of the
date first above written.


WILLIAM BLAIR & COMPANY, L.L.C.



Acting as Representative of the
several Underwriters


By: William Blair & Company, L.L.C.


By: ______________________________________
         Principal


                                      -31-