Abstract: Investigation and interview, sociometry and observation aresynthetically applied to the study of interpersonal relations betweenfreshmen, sophomores and seniors in 21 classes as separate collectives.The results show: 1) There are certain features in the informal inner structures ofcollege classes, 2) Significant personality traits are found in the two extremetypes in a class-the most popular and the most unpopular. 3) The basic criteria used by college students in choosing friendsare moral character and psychological similarity. 4) The college students expect their class leaders to possesscertain mental traits as basic requirements. 5) There is a close connection between a college student's self-concept and his or her interpersonal relations with classmates.

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