Definitions for "System dynamics"
a method to model and analyze the holistic behavior of complex, managed systems as they evolve over time
A methodology for studying complex systems by looking at the interactions of their component parts. System Modeling - Using modeling software to design a model of how the parts of a system interact to produce behaviors and outcomes.
The study of how systems actually behave, using models to simulate the assumptions and rules being followed. Often the behaviour seen is very different than the behaviour people expect.
Keywords:  thinking, foundation
The Foundation of Systems Thinking