2. Plomin, R. (1986b). Development, genetics, and psychology. Hillsdale, NJ: Lawrence Erlbaum Associates.

"This book is based on two simple ideas. The first is that genes are involved in change as well as continuity in development. The second is that the best
way to study effects of environment on behavior is through the study of genetic influences, employing the theory and methods of quantitative genetics . . . Research in developmental behavioral genetics has just begun; nonetheless, significant advances have been made and these have important implications for developmental psychologists. The approach of behavioral genetics is highly empirical,an orientation that is reflected in this book. I do not attempt to argue or persuade as much as to present methods and data that I hope speak for themselves." (from the Introduction)