EXHIBIT 11

                                 October 1, 2001


[SunAmerica Letterhead]


SunAmerica Strategic Investment Series, Inc.
The SunAmerica Center
733 Third Avenue
New York, New York  10017-3204

Ladies and Gentlemen:

         I have acted as counsel for SunAmerica Strategic Investment Series,
Inc. (the "Fund"), a Maryland corporation, in connection with the proposed
acquisition by each separate investment portfolio of the Fund designated as an
"Acquiring Fund" (each, an "Acquiring Fund" and, collectively, the "Acquiring
Funds") in the Agreement and Plan of Reorganization dated September 28, 2001
(the "Agreement") by and between the Fund and North American Funds, a
Massachusetts business trust ("NAF"), of all of the assets of the corresponding
investment portfolio of NAF designated as an "Acquired Fund" (each, an "Acquired
Fund" and, collectively, the "Acquired Funds") in the Agreement, in exchange
solely for shares of the respective Acquiring Fund and such Acquiring Fund's
assumption of all of the liabilities of the Acquired Fund. Capitalized terms
used and not otherwise defined herein shall have the respective meanings
ascribed thereto in the Proxy Statement and Prospectus (as defined below).

         This opinion is furnished in connection with the Fund's Registration
Statement on Form N-14 under the Securities Act of 1933, as amended (the
"Registration Statement"), relating to Class A, Class B, Class II and Class I
shares of common stock of each of SunAmerica Stock Index Fund, SunAmerica
Science & Technology Fund, SunAmerica Aggressive Growth LifeStage Fund,
SunAmerica Moderate Growth LifeStage Fund and SunAmerica Conservative Growth
LifeStage Fund, par value $0.0001 per share (the "Shares"), to be issued in each
Reorganization.

         As counsel for the Fund, I am familiar with the proceedings taken by it
in connection with the proposed authorization, issuance and sale of the Shares.
In addition, I have examined and am familiar with the Articles of Incorporation
and the By-Laws of the Fund, in each case as amended, supplemented, and in
effect on the date hereof. I have also examined a certificate issued by the
State Department of Assessments and Taxation of the State of Maryland,
certifying the existence and good standing of the Fund, and such other documents
as I have deemed relevant to the matters referred to in this opinion.

         Subject to the effectiveness of the Registration Statement and
compliance with applicable state securities laws, and based on and subject to
the foregoing examination, I am of the opinion that subsequent to the approval
of the Agreement as set forth in the proxy statement and prospectus constituting
a part of the Registration Statement (the "Proxy Statement and Prospectus"), the
Shares, upon issuance in the manner referred to in the Registration Statement,


for consideration not less than the par value thereof, will be legally issued,
fully paid and non-assessable shares of common stock of the Fund.

         I am a member of the Bar of the State of Maryland. Insofar as any
opinion expressed herein involves the laws of the State of Maryland, such
opinion should be understood to be based on my review of the published statutes
of such state, and, where applicable, published cases of the courts and rules or
regulations of regulatory bodies of such state. I hereby consent to the filing
of this opinion as an exhibit to the Registration Statement and to the use of my
name in the Proxy Statement and Prospectus constituting a part thereof.


                                                     Very truly yours,

                                                     /s/ Robert M. Zakem

                                                     Robert M. Zakem, Esq.