The growth of American families studies an assessment of significance.

This is a review focused mainly upon the book Fertility and Family Planning in the United States, by Pascal K. Whelpton, Arthur A. Campbell, and John E. Patterson, published by Princeton University Press in 1966, and representing the results of the second GAF survey (1960). The initial GAF survey was conducted in 1955 and resulted in the book Family Planning, Sterility, and Population Growth, by Ronald Freedman, Pascal K. Whelpton, and Arthur A. Campbell, published by McGraw-Hill in 1958.A basic purpose of the GAF studies, as contrived by Whelpton, was that of trying to improve the bases for population estimates by learning from young women themselves the number of children that they expected to have altogether and during the next five years. By repeating the study five years later, it was hoped to test the validity of replies on expectations by comparing them with subsequent performance. This involved interviewing not the same women but the same types of women in 1955 and 1960.The GAF studies have indicated the usefulness of questions on number of children expected. They suggest that the replies of 1955 have low predictive value for individual behavior but high predictive value for group behavior. They have provided invaluable data on other aspects of fertility unavailable from official sources, such as family planning, fecundity, and the influence of religion. The chief inadequacies of the GAF studies have been those associated with small numbers. Moreover, definitive comparisons of expectations with performance would seem to require longitudinal studies of the same women rather than periodic studies of the same types of women. On the other hand, the latter type of design doubtless is preferable for other purposes.Besides the yield of new data on fertility, the GAF studies have been significant in that one government agency provided the funds for the National Fertility Survey of 1965, which was essentially a third round of the GAF studies, and another government agency is considering the institution of regular surveys of the GAF type in order to provide a wider scope of data relating to fertility. The volume under review is at once a fitting living memorial to the senior author and the Scripps Foundation, a credit to the coauthors, and a worthy model for future studies.