The purpose of this study is to examine the characteristics of peer groups that pupils form, after selecting one another, during the various primary school classes. One hundred and fifty-nine 4th, 5th and 6th grade pupils, attending urban schools in the provinces, took part in the survey. Moreno's sociometric recommendation test was provided for the collection of data. The results show the group characteristics divided into class and sex. Significant discrepancies emerged between the classes and the two-gender sample with respect to the percentages of pupils selecting one another in the groups. In the meantime, it was established that a number of students participate in groups which do not socialise with the rest of the class members. (Contains 2 tables.)