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<PAGE> EXHIBIT 23.1 CONSENT OF DELOITTE & TOUCHE LLP INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statement of BARRA, Inc. on Form S-8 of our report dated April 20, 2000, appearing in the Annual Report on Form 10-K of BARRA, Inc. for the year ended March 31, 2000. /s/ Deloitte & Touche LLP September 8, 2000
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