Abstarct: According to the importance of "Motivation" on improving the efficiency of Human Resources programs and improving the amount of job satisfaction among the organizations staff, in this study, we have investigated the structure of incentives in RIPI Tehran. By examining the actual trends and conditions of the research institute, three factors were selected as the major ones affecting motivation. These factors are mentioned as: Technical skills, Reward and Discrimination. Using the three factors mentioned above, a model was proposed for the study. After localization of standard motivation questionnaires and benefiting from professors’ viewpoints, a questionnaire was designed for this study with minimal error. The Reliability and validity of the questionnaire, indicates its quality. The collected data were analyzed using correlation and regression tests. Sophisticated algorithms of random forests were used for ranking the variables which are believed to be an innovation at this research. Finally, results are compared with the theories of motivation to properly check the validity of the results.