Subseries contains materials pertaining to Gerda G. Fillenbaum's involvement with the development and use of the Older Americans Resources and Services Program (OARS). The Duke OARS assessment methodology was at the forefront of developing a reliable, valid, systematic multidimensional functional assessment of older adults. The subseries also contains materials related to OARS studies conducted by entities outside of Duke and Duke projects and programs built on the OARS methodology. Types of materials include correspondence, questionnaires, order forms, manuals, receipts, reprints, reports, drafts, notes, publications, user lists, brochures, and a CD. Materials date from 1972 to 2018.