Support for the confluence model of intellectual development has come from analyses of family size-birth order means of large aggregate data sets. Analyses of individual scores do not substantiate the confluence model, as explained variance is markedly reduced. The study of family interaction variables utilizing longitudinal data is recommended.…

This book is organized in nine parts, as follows. Part I, "Preface," includes an account of how the author went from the rather esoteric research on theoretical problems in serial rote learning to research on the inheritance of mental abilities and its implications for education. Part II, "How Much Can We Boost IQ and Scholastic Achievement?," is…

The major interest of this study is the amount of time children spend reading. Data was gathered unobtrusively by having the 150 5th grade subjects keep time records of all their activities for a 2 week period. These were coded into 7 categories and scores were related to those derived from tests of ability, achievement, self-concept and reading…

More than 17,000 children were interviewed or tested to investigate their political attitudes. Data relevant to social class and intelligence are as follows: compared to others, children of high intelligence acquired political attitudes earlier, saw the Supreme Court as a more powerful decision maker, perceived laws as less rigid, had more…

This study focuses on the effects of family size and spacing on intellectual, social, and personality development of children. The sample consisted of 533 suburban, middle class, large family (five or more) and small two child family children. The children, 233 boys and 300 girls, were teenagers attending either junior or senior high school.…