K. Warner Schaie and Sherry L. Willis
Department of Psychiatry and Behavioral Sciences, University of Washington
This presentation will describe the design of the Seattle Longitudinal Study (SLS) and key study findings regarding developmental change in psychological functioning across the adult life course.
Dr. K. Warner Schaie began the Seattle Longitudinal Study (SLS) in 1956 in cooperation with the Group Health Cooperative of Puget Sound (GHC). Dr. Sherry L. Willis became principal co-investigator of the study in 1983. The study involves a cohort-sequential design in which multiple birth cohorts have been studied longitudinally over the same developmental period in each cohort's life course, permitting examination of cohort differences in longitudinal change. The study involves seven-year waves, since 1956: 1963, 1970, 1977, 1984, 1991, 1998, and 2005.