Analyzes the extent to which migration has influenced the character of Chicago's metropolitan population. It examines differences among various economic and demographic characteristics of the migrant and native populations in 1966 such as age, race, sex, education, employment experience, and incomes from various sources, as well as identifying place of residence at previous points in time, and distinguishing local from interregional moves. Attributes of the migrant and native populations were very nearly identical in 1966. Although migration has increased the proportion of nonwhites in the region, it apparently has not caused any marked decline in the skills, educational levels, or employment attributes of the region's residual population base, nor has it contributed to any overall improvement in these characteristics. Evidence indicates that Chicago's urban problems stem not from migration but rather from more basic forces underlying the region's economic and social structure. (See also R-1387, R-1388.) 67 pp.