process has begun, but much remains to be done before satisfactory measures are available. Moreover, the effect of reengineering on the number and characteristics of future beneficiaries also needs further study. The agency, therefore, is now engaged in a multiyear, complex research effort to develop and validate the redesigned decision process. Considerable thought, study, and effort is being invested in developing a research agenda.

SSA has requested the National Academy of Sciences to conduct an independent, objective review of, and make recommendations about, the reliability, validity, adequacy, and appropriateness of its current and proposed research activities as they relate to the proposed redesigned disability decision process. Included in the review is the approach, survey design, and content of the complex multiyear DES. The results of that review are the subject of this interim report and of the committee's ongoing work. (See the Appendix for the study mandate.)

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