In the knowledge age, performance evaluation is one of the vital components of each organization, and educational organizations are no exception. Teachers are believed as the single most important factor influencing students' academic success or failure. Considering the pivotal role of teachers, educational systems need to not only be assured that teachers perform at their best to enhance student learning, they also urgently require attempting to identify strengths and weaknesses in teachers' practice for further professional development. The AMO theory of human resource management represents that the three independent system components which characterize an individual are: ability, motivation, and opportunity. Since there are many interactions between and among the components of a system, the system dynamics approach was selected to observe the changes in the behavior of an individual (system) overt time. For the purpose of this study, three types of surveys encompassing both Likert-scaled items and open-ended surveys were developed and then English language experts and teachers were asked to take participate in the process of data gathering. The results indicated that factors of teachers' ability and motivation will affect teachers' performance more than opportunity factors during the next 72 months in an S-shaped manner of behavior.