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Seattle Longitudinal Study (SLS) (ICPSR 158)
Released/updated on: 2006-06-19
Geographic coverage: Seattle, United States, Washington
Begun in 1956, the Seattle Longitudinal Study (SLS) is designed to study various aspects of psychological development during the adult years. The SLS has continued in seven-year intervals since 1956: 1963, 1970, 1977, 1984, 1991, and 1998. At each interval, all persons who had previously participated in the study were asked to participate again, and an additional new group of people are also selected and asked to participate. In addition to the main study, data was collected in 1989-1990 from adult children and siblings of the main study participants in an effort to determine the extent of family similarity in mental abilities and other psychological characteristics. Many of these relatives were studied again in 1996-1997, and in 2002, grandchildren of the main study participants also began to participate, making the SLS a three-generation study of cognitive abilities.