EXHIBIT 11

VEDDER PRICE                              VEDDER, PRICE, KAUFMAN & KAMMHOLZ
                                          222 NORTH LASALLE STREET
                                          CHICAGO, ILLINOIS 60601
                                          312-609-7500
                                          FACSIMILE: 312-609-5005

                                          A PARTNERSHIP INCLUDING VEDDER, PRICE,
                                          KAUFMAN & KAMMHOLZ, P.C. WITH OFFICES
                                          IN CHICAGO, NEW YORK CITY AND
                                          LIVINGSTON, NEW JERSEY


                                          January 9, 2003



Janus Investment Fund
100 Fillmore Street
Denver, Colorado  80206

Ladies and Gentlemen:

         We are acting as special counsel for the Janus Investment Fund, a
Massachusetts business trust (the "Trust"), in connection with the Trust's
filing of a pre-effective amendment to the registration statement on Form N-14
(File No. 333-101816) (the "Amendment") with the Securities and Exchange
Commission covering the issuance of shares of beneficial interest, with a par
value of $.01 per share (the "Shares"), in the following series: Janus Venture
Fund, Janus Growth and Income Fund, Janus Enterprise Fund, Janus Balanced Fund,
Janus Overseas Fund, Janus Olympus Fund and Janus Global Technology Fund (the
"Acquiring Funds"), pursuant to the proposed reorganizations with the Berger
Growth Fund, Inc. and the Berger Large Cap Growth Fund, Inc., with the series of
shares of the Berger Investment Portfolio Trust designated as Berger Mid Cap
Growth Fund, Berger Small Company Growth Fund, Berger Balanced Fund and Berger
Information Technology Fund, and with the series of shares of the Berger
Worldwide Funds Trust designated as Berger International Fund (the "Selling
Funds"), as described in the Amendment and pursuant to (i) the form of Agreement
and Plan of Reorganization by and among the Trust on behalf of the Acquiring
Funds (other than Janus Overseas Fund) and the Berger Growth Fund, Inc., Berger
Large Cap Growth Fund, Inc., Berger Investment Portfolio Trust on behalf of each
Selling Fund (other than Berger International Fund), and Janus Capital
Management LLC; and (ii) the form of Agreement and Plan of Reorganization by and
among the Trust on behalf of the Janus Overseas Fund, Berger Worldwide Funds
Trust on behalf of the Berger International Fund, Berger Worldwide Portfolios
Trust and Janus Capital Management LLC, each as included in the Amendment (each
an "Agreement").

         As special counsel to the Trust, we have examined such Trust records
and other documents and certificates as we have considered necessary or
appropriate for the purposes of this opinion. In our examination of such
materials, we have assumed the genuineness of all signatures and the conformity
to original documents of all copies submitted to us.

         Based upon the foregoing, and assuming that the Trust's Amended and
Restated Agreement and Declaration of Trust, dated January 31, 2002, and the
Trust's By-Laws adopted February 11, 1986, as amended on December 8, 1995,
January 6, 1997 and September 18, 2002, each are presently in full force and
effect and have not been amended in any respect except as







VEDDER PRICE

Janus Investment Fund
January 9, 2003
Page 2



provided above, and that the resolutions adopted by the Board of Trustees of the
Trust on December 3, 1990, January 18, 1991, February 14, 1992, May 8, 1992,
December 3, 1993, September 27, 1995, September 14, 1998 and December 9-10, 2002
relating to organizational matters, securities matters and the issuance of the
Shares described in the Amendment are presently in full force and effect and
have not otherwise been amended in any respect, we advise you and opine that (a)
the Trust is a Massachusetts business trust validly existing under the laws of
the Commonwealth of Massachusetts and is authorized to issue an unlimited number
of Shares in the Acquiring Funds; and (b) upon such issuance of the Shares in
accordance with the Agreements, and assuming that the Trust continues to validly
exist as provided in (a) above, the Shares are and will be legally issued and
outstanding, fully paid and nonassessable.

         We hereby consent to the use of this opinion as an exhibit to the
Amendment. This opinion is solely for the benefit of the Trust, the Trust's
Board of Trustees and the Trust's officers and may not be relied upon by any
other person without our prior written consent.

                                           Very truly yours,

                                           /s/ Vedder, Price, Kaufman & Kammholz

                                           VEDDER, PRICE, KAUFMAN & KAMMHOLZ

DAS
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