\textbf{Simulation Model Skill in Cosmology}

What role can/could simulation play in supporting, puzzle-solving, modifying, disconfirming, or falsifying $\Lambda $CDM and its competitors? I review some of the problems cosmologists have solved or hope to solve using computer simulation, and examine some of problems and successes that have emerged. I draw some conclusions regarding the kind of simulation model skill we should expect to find in Cosmology.