This study aimed to investigate the factors affecting the success of the succession planning system in the education department of the Iranian city of Garmsar. Falling under applied research, this study selected around 100 principals, teachers, office employees, etc. working at the education department as its statistical population. The sample size was 66 people who were randomly given questionnaires. A standardized questionnaire was used to collect data. To measure the questionnaire’s reliability, Cronbach’s alpha was used and was estimated at 0.8912. The questionnaire’s data were analyzed by the SPSS 21 software. Findings showed that the executive planning model at the Garmsar Education Department followed the principals’ competency model. With a significance value of less than 0.05, the variable of Competency Model components was found to significantly affect the way succession planning could be enforced at the department, suggesting a positive and direct effect.