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I do think it is a useful exercise though to go through your entities and see if these various "components" or attributes of one entity make sense with another entity. Like, if you have a RTS with some resources and units, which of the units' attributes could apply to a resource? What if a resource could attack? Or if it could move (e.g. deer in AoE)? Or maybe it can be destroyed and explodes doing damage with a large blast radius. I think as a practice this approach generates a lot of creative ideas and leaves an opening for making these changes late into the process of programming a game.