The present report is the third in a series of short interim reports of the National Academies' Committee to Review the SSA's Disability Decision Process. This third interim report relates directly to one of the contract tasks-review of the design, approach, and content of the DES, as proposed by SSA's contractor for the survey, Westat, Inc. This report is limited to a brief review of the sample design (including that of the pilot study), instruments and procedures, and response rates goals developed by Westat and provided by SSA in June 1999 to the committee for its review and recommendations. It also comments on the proposed timeline for initiation of each phase of the survey.