The present study aims to study the effectiveness of selfdifferentiation therapy on assertiveness of female students of Allameh
Tabataba’i University. The research employed a semi-experimental
design with pre-test and post-test. Using convenience sampling
method, 20 subjects were selected from among first-year
undergraduate female students of the Faculty of Psychology and
Educational Sciences, Allameh Tabataba’i University. The sample
populated was randomly assigned into two groups, namely experiment
and control groups, each consisting of 10 people. The experiment
group received 8 sessions of self-differentiation therapy. The control
group received no intervention. The data was analyzed using
Covariance analysis. The results showed that self-differentiation
therapy was effective on improvement of assertiveness (P<0.01).
Generally, it can be concluded that self-differentiation therapy helped
to increase the level of assertiveness of the participants