A dissertation report submitted to Mzumbe University, Dar es Salaam Campus College in Partial Fulfillment of the Requirements for the Award of the Master Degree of Science in Human Resources Management of Mzumbe University.Employee motivation has become an important issue given their responsibility to impart knowledge and skills to any organization. Consequently, this study investigated the Assessment of Motivation as a tool for good Performance in organization, having the National Social Security Fund (NSSF) Head Office, in Dar es Salaam as the case. Also the study seeks to investigate the relationship between motivation and performance. Specifically, the study sought to find out whether motivation of employees had any effect on their morale to perform and; the effect of intrinsic and extrinsic motivation on the performance of employees. A descriptive survey research design was adapted where a total population of 150 employees was made whereby the sample size of 50 respondents was consulted which is 33.3% of the whole population. The primary data was collected using structured questionnaires for employees, as well as key informant interview guides for head of section and management. Consequently, both qualitative and quantitative data were collected. Despite Motivation is a tool that highly influences performance, it is not well implemented such results cannot be obtained some of the reasons that hinders good implementation of this tool include, lack of access to various packages despite being given or state as benefit. In order to improve employee motivation and performance at work, the study recommended that, the management should establish motivational scheme, policy concerning motivation should be revised time to time, other motivational packages should be introduced to employees and lastly personnel department should be emphasized.