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This study was carried out to identify the level of Science and Technology student teachers' science process skills and to determine how efficient I diagrams are in developing these skills. The corpus of the study was consisted of 40 science and technology student teachers who were having Instructional Technologies and Material Design course during the 2009-10 academic years at Amasya University, Faculty of Education. The study was conducted as a basic experimental design. A science process skills test was applied on the student teachers as pre-test and post-test, then the points they got from each test were compared. During the study, the student teachers developed I-diagrams on science topics with the guidance of their supervisors. The results revealed that the student teachers had problems with the pre-tests, and especially with the integrated process skill. At the end of the study it was observed that the student teachers' skills on developing I-diagrams were increased as well as their integrated process skills problems were disappeared. Accordingly, it was concluded that I-diagrams were important for the acquisition and development of science process skills