More than 20 years ago, researchers first noted that children of alcoholics (COA's) appeared to be affected by a variety of problems over the course of their life span. Such problems include fetal alcohol syndrome, which is first manifested in infancy; emotional problems and hyperactivity in childhood; emotional problems and conduct problems in adolescence; and the development of alcoholism in adulthood. Although much has been learned over the ensuing two decades, a number of controversial research areas remain. In particular, debate stems from the fact that despite a common interest in COA's, clinically focused literature and research-focused literature have resulted in two distinct bodies of knowledge. This article reviews important research results, with emphasis on findings generated by the alcohol-research community. Attention also is given to examining the empirical validity of concepts that have been advanced by several influential clinicians from the COA field.