"The use of a Swedish sample (N=466) is an important strength of the research....One of the most important results of this study is the mediating effect of peers on the results and the long-term consequences of pubertal timing."—Archives of Sexual Behavior"...the research project from which this book is derived should be the standard citation for a data set exemplifying the developmental contextual view of human development. To the extent that this research is the exemplar of the importance of what may be a new theoretical paradigm -- not only for developmental psychology but for the study of human behavior in general -- then Magnusson's IDA project may be the single most important longitudinal study of this century."—Contemporary Psychology"...a path-breaking glimpse at the interaction of biological and psychosocial development across a 16-year period."—Merrill Palmer Quarterly