The present study was carried out with the purpose of internal evaluation of educational groups in dentistry faculty of Tabriz Medical University using CIPP model. Statistical population of this descriptive- cross sectional study consists of faculty members (n=106) and specialized assistants (n=108), conducted as whole counting. Questionnaires in four aspects of context, input, process and product were used to collect data. Reliability coefficient was obtained by Cronbach’s Alpha method. It was 0.886 for faculty members and 0.916 for assistants. Descriptive statistical methods were used for data analysis. In the context aspect, it was assessed fairly favorable and favorable by professors and assistants, respectively, for Endodontics, dental Prosthodontics, Pathology and Pediatric dentistry groups; it was evaluated fairly favorable for the other groups according to both perspectives. Professors of Periodontics group evaluated the input aspect fairly favorable and the assistants evaluated it favorable; Radiology professors assessed the input favorable and assistants recognized it fairly favorable and in other groups, professors and assistants assessed the input aspect fairly favorable. The process aspect was evaluated fairly favorable in Orthodontics, Pediatric and Radiology groups, favorable in Pathology group, and fairly favorable according to the professors and favorable according to the assistants in other groups. The product aspect was favorable in operative and Pathology groups from professors' viewpoints and fairly favorable according to the assistants' opinions.