System Dynamics is a valuable tool for understanding and predicting the behavior of complex systems in a variety of fields by using this approach decision makers can make more informed choices and improve performance in environmental social economic and organizational systems. System Dynamics is an approach used to understand the behavior of complex systems over time. It employs feedback loops and time delays that affect the behavior of the entire system. The methodology involves the problem worrying the decision$-$makers are clarified and the variables that impact on the problem are identified. Feedback loop model is constructed that reveals the relationship between the variables. System Dynamics captures basic interactions in the syste. Compares real world activity and once a decent correspondence has been achieved, experiments are conducted on the model to see how alternative decisions can improve performance. Forrester $(1971)$ argues that this methodology combines the power of the human mind with the strengths of todays computers. The human mind is best in the early stages, and the computer takes over to reveal the unexpected consequences that arise from complexity and the dynamic behavior of the system.