Performance appraisal is a mechanism for determining the performance levels of employees in any organization based on reward and remedy programmes implemented. Thus, Open Performance Review and Appraisal system are employed as the tool to enhance primary school teachers’ performance in Misungwi district. Introducing or adapting a new system of performance appraisal was expected to improve teachers’ performance, though the situation of having no changes in performance of primary school teachers’. This study indulged itself to deal with this phenomenon. The study was guided by four research objectives: examine the importance of OPRAS to primary school teachers; assess the quality and standard of using OPRAS as a tool for enhancing teachers' performance; explore the efficiency of using OPRAS as a tool for enhancing teachers' performance and examine the perception of teachers towards OPRAS. The empirical and theoretical literatures were reviewed from which the study prepared the conceptual framework and used Herzberg’s two factor and the Equity theories. The mixed method approach was used and this study was guided by methodological triangulation design, employed by questionnaire, interviews and documentaries collect data which were analyzed by statistical tools of frequencies and averages and finally presented in tables and diagrams by use of statistical package for social sciences (SPSS). The major findings were; OPRAS is very important, but the government put less effort on it, the quality and standards of OPRAS are very poor, there is little efficiency of using OPRAS goals are not achieved and teacher has a negative perception toward OPRAS.