The element of task difficulty is inherent in the design of simulations, games, and experimental testbeds. However, there is no organizing and quantifying framework for the construct of task complexity especially for team tasks. Thus, the purpose of this paper to present a framework of complexity to facilitate researchers who are investigating the relationship between complexity and other training relevant variables (e.g., teamwork skills and team performance). To that end, this paper defines the complexity, provides the organizational framework, and offers a context and examples to provide a deeper understanding of how the framework is instantiated.