A Dissertation Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Public Administration (MPA) of Mzumbe University.The study assess existing challenges with Open Performance Review and Appraisal System (OPRAS) in Government Authorities was carried out at Rufiji Basin Development Authority (RUBADA). The specific objectives were to evaluate techniques used in conducting OPRAS, to determine how feedback obtained through OPRAS is used, to identify challenges faced in the implementation of OPRAS, and to examine problems associated with OPRAS. The study involved a sample size of 51 respondents drawn from the Authority who were selected using random and purposive sampling techniques. The data were collected through a combination of techniques namely; interviews and questionnaires. The collected data were analyzed through the use of SPSS, discussed and presented through the use of figures, tables as well as text. The findings of the study revealed that most employees were not aware with the techniques used at RUBADA in conducting OPRAS since they find it more complicated and confusing. Moreover the study shows that most employees had little knowledge about OPRAS. Subordinates were not aware with the OPRAS form provided to them. Most of them often fill performance appraisal form only once per year. This rate which is used by directors and managers to evaluate their subordinates in the year is highly minimal. Moreover, majority had not participated in setting performance objectives. It was also found that most supervisors had little time to discuss and agree on targets with their subordinates. It was further noted that most of employees were not provided with any OPRAS feedback. Based on the findings, it is recommended that Management at RUBADA should make sure that the staff are well trained so that they can participate effectively in filling OPRAS forms and feedback to be provided at the required time to ensure that high performance is maintained.