This paper reviews research studies dealing with the effects on families of changes in the labor force patterns of working mothers during the period from 1970 to l980. Research information is presented in a column format: the first column provides the study findings, the second points out the sources of the findings, and the third suggests interpretations of results. Findings are organized under the following topic areas: children of working mothers, working mothers of two-parent families, mothers' labor force attachment, working mothers' contributions to family incomes, wives without children, and single parent families. Statistical data related to the topics discussed in the paper are also provided in a tabular form. (MP)