EPTANCE by the social group is an important need of the individual in our culture. The relationship between this social acceptance and specific life experiences, however, is little understood. This research reports findings comparing sociometric acceptance with the background experiences of adolescent boys at three economic levels.Psychologists in almost every field of specialization have placed great emphasis on background experiences in the study of personality development. The social worker emphasizes the case history, the clinical psychologist stresses environmental factors in the etiology of neuroses and psychoses, and the personnel psychologist utilizes case history items in the application blank. However, it is unfortunately true that some psychologists will interpret certain background experiences as being particularly important in the creation of some given ill-defined behavior pattern solely on the basis of their adherence to a theoretical system.Recent progress has been made in both civilian and military research, particularly in the latter, where background data have been treated more objectively and have been related to such criteria as leadership ( 16), occupational success (3,4,8,12,15), and personality adjustment (2, 7,10). The most systematic quantification of background data was accomplished by the Personnel Research Section, AGO ( 14) in their development of the Bio-1 This study was submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at New York University Graduate School of Arts and Science. The author wishes to express his gratitude to the staff of Richardson, Bellows, Henry, and Company, Inc., particularly Dr. Marion W. Richardson, who have helped greatly as statistical advisers. He desires to acknowledge the assistance of Dr. David Segel of the Federal Security Agency, Department of Education, in the obtaining of the Indiana sample, and Dr. Sheldon S. Zalkind and Dr. Max Smith for valuable editorial suggestions.A special debt of gratitude is due Professor Douglas H. Fryer, under whose direction this thesis was undertaken and under whose guidance and encouragement it was completed.