The purpose of this research was to develop suggestions for the effective implementations of course inspections which have been assigned to the school principals by means of a regulation in the year 2014, based on the evaluations of supervisors, teachers and supervisors. In this qualitative research case study design was used. The participants of the study were composed of 122 teachers, 66 principals and 43 supervisors. The data were collected via the interview form developed by the researchers. Content analysis technique was used for the qualitative data and descriptive statistics such as frequencies and percentages were also reported. The findings were summarized as follows: The participants' views about the reasons for this application and their levels of acceptance differed. Teachers and principals evaluated the application positively and inspectors considered it negative. Concerns such as implementation might increase bias and that principals with their current competencies would not be able to contribute adequately to the teaching, were mentioned. The principals were not trained in course inspection, they rarely did inspection in the past and those inspections were found to be ineffective by the teachers.