Advanced in-service education has provided the development regarding individual's knowledge and attitude level, in the high quality form. The application of in-service education has been a key component of knowledge and attitude improvement of Jihad Keshavarzi experts. The study utilized experimental Solomon four group designs to determine the effect of in-service education on Jihad Keshavarzi experts' attitude regarding soil conservation importance. Results demonstrated that subjects learned from the presented course and achieved higher level of attitude, and demonstrated that there is significant difference among attitude level of clients. Post hoc analysis demonstrated that participants in treatment groups (E and C2) answered significantly greater numbers of questions correctly on the post-test exams and achieved significantly higher level of attitude than the control groups (C1 and C3) and there was significant difference between attitude level of participants in pretest and posttest in E group but there was no significant different between attitude level of participants in pretest and posttest in C1 group.
Key word: Jihad Keshavarzi experts, Solomon four group design, in-service educational, soil conservation.
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