This report contains the proceedings of four sessions of the Interagency Panel for Research and Development on Adulthood (October 1978 - April 1979): (1) Postsecondary Education Reauthorization and the Adult/Nontraditional Learner, (2) Changing Socio-Demographics in the United States and Their Impact on Social Institutions, (3) Stress and Social Support throughout the Life Course, and (4) Cross-Agency Perspectives of Research and Development on Adulthood. The panel documents (and the meeting) provided forums for exchange and coordination among federal agencies having a research and development mandate in the area of cognitive and physical adult development. The complete text is provided for three presentations: "Overview by Activities in the Reauthorization of the Higher Education,""Old Age and Family Functioning," and "Research in Mental Health and Aging." The appendix, History of the Adulthood Panel: May 1977 - June 1978, contains notes from seven meetings of the panel. Topics include Lifetime Distribution of Education, Work and Leisure; Status of Research on Adult Development and the Limits of Human Educability; Population in Retirement and Approaching Retirement: Research Issues; Identification of Learning Needs of Adults; Occupational Mobility: Implications for Adult Development; Current Activities and Future Needs; and Human Competence from a Health Perspective. (YLB)