The data collection procedures for a study of a population of 2400 immigrant children in Sweden are described. Means, dispersions and intercorrelations for 22 variables are given. Social and emotional adjustment figures are found to be higher than expected, and correlate only minimally with second language achievement figures. It is concluded that the problem of immigrant adaptation is far more complex than is often assumed and that other variables than language, such as social, emotional, cognitive, perceptual, psychomotor, personality and cultural variables, are involved and may be as important as language. (Author/DB)