“…This said, the prob lem may be "impossible in princi ple but more tractable in practice." In a given study, researchers can address the issues, as some have done in multimodeling experiments in recent years that addressed complex po liti cal, military, and economic interactions in simulated intervention operations (Lofdahl, 2010) and connecting agent-based network models and a system-dynamic-style model (Carley, 2012;Levis et al, 2010). It seems that great advances could be made with a combination of (1) a concept of best practices, (2) methods that or ga nize thinking about composition, (3) modular development with better documentation and comprehensibility, and (4) technology that facilitates following the best practices, including systematic testing across the relevant state space and documenting as much as pos si ble assumptions that other wise would merely be in the head of the modeler/programmer.…”