It is getting difficult day by day to comply with the sweeping changes in our age. In such an age, it is necessary that teachers being responsible for educating students, follow the developments, overcome the deficiencies and bring contemporary approaches into classrooms. And this could only be achieved via well-structured in-service trainings/professional development programs. Trainings about different topics in different durations are realized for the professional development of the principals, deputy principals, teachers and school staffs by contracted institutions under the heading of "in-service training". Aim of this study is to analyze the in-service trainings being held for elementary and secondary school teachers. For this reason, these questions are searched for an answer: "Which topics are mostly covered in elementary and secondary school teachers' in-service trainings held by MONE?", "In which areas were the teachers' knowledge/skills/attitudes intended to be developed in the last 10-year-period?", "What is the satisfaction level of teachers about these trainings?" In the research, content analysis has been carried out and the trainings are classified under 8 main categories. The research results obtained from the Council of Higher Education Thesis Center and EBSCO, which includes school teachers' opinions about in-service training, introduced that the in-service training quality in Turkey doesn't meet the expectations. (C) 2015 The Authors. Published by Elsevier Ltd.