The present research tries to test the effectiveness of some acts aiming at developing the skills of deductive thinking for postgraduates in faculty of education via applying deduction rules on the formal problem model concerning the subject of programming things as an example. The deductive thinking is defined as the process of using postulates and premises in order to reach the particulars (elements of programing forming the final design). The research sample included )20( postgraduates from faculty of education, Tanta University. It is remarked that stages of designing programming was coincided with applying of deductive thinking skills.(20)-clause- test was formed to measure the deductive thinking for students focusing on (3) basic skills: induction, deduction and inference. These skills aim at knowing students ability to thinking about issues and topics and how good they are. Results showed that the more programming skills students have, the cleverer they are in deductive thinking skills