This report presents information on the interrelation of selected behavioral characteristics of children six to eleven years of age as obtained in the Health Examination Survey of 1963-65. Data were obtained from the parents on a self-administered medical history questionnaire and a more detailed supplemental medical history administered by a Survey field representative. From these data assessments were made of the extent of association among a number of behavioral variables: early behavior development, sleep-related behavior, eating habits and behavior, peer relationships, abnormal fears, behavioral traits (temper and tension), degree of responsibility in the home, and participation in organized activities in and outside of school. The relationships among these aspects of children's behavior generally were of a low order of magnitude. However, some strong associations were found which reached statistical significance; where possible, comparisons were also made with findings from previous studies. Tables provide detailed data, and charts and tables accompany the text. Appendices include facsimiles of parts of the questionnaires used in the survey. (Author/SES)