The Impact of Assertiveness Instruction through Group Counseling on the Self-esteem of High-School Female Students

In order to choose the research sample, a high school in Tehran (District 11) was selected. One hundred students were chosen from among each level through random stratified sampling method to achieve equal distribution. The Cooper Smith Self-Esteem Test was administered to 300 students. After data analysis, 60 students who had the lowest scores were selected and were randomly assigned to two groups of 30. The experimental group received instruction. The above-mentioned test was once again administered to both groups at the end of instruction and also as a follow-up, one month after the instruction. The data were analyzed using descriptive statistics, inferential statistics, and repeated measures ANOVA (two-factors). The findings showed significant differences among various stages of the test, namely, preinstruction, post-instruction and one month later in the follow-up. Also there were significant differences among the experimental and control groups, all of which are the results of the independent variable exerted by the researcher.