In this study, a research was made regarding effect of volleyball training on the social self-efficacy expectation and the assertiveness in the individual group of 14-16 years of age. For experiment and control groups constituted per 20 boys. Experimental groups were taken to fundamental volleyball trainings especially pertinent with their branches twice a week for 36 weeks (9 months). 20 students in the control group was not subjected to any training programme. Individual Inquiry, Social Self-Efficacy Expectation Scale and Rathus Assertiveness Inventory were delivered with appointed experimental and control groups as pre-test at the beginning of October prior to training start, and there after, follow up test was delivered at the beginning of march and the last-test was made at the end of june. Obtained datas were tested on S.P.S.S. 13.0 statistic programme. Consequentially, basic volleyball trainings pertinent with branches applied during 9 months was a positive factor increasing level of Social Self- Efficacy Expectation and Assertiveness individuals of 14-16 years of age.