Setting / Backdrop has come up in some recent discussions as well, regarding a game in design and situations. How much is too much or too little? I think that depends on your taste. A game like Symbaroum is heavy setting. Glorantha is heavy setting as well and it changes depending on the system you play it with. Shadowrun is tied to the Sixth World and Earthdawn is tied to the Fourth (I think).
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I've shifted our focus more fully into the concrete experience of designing a game. I'm also finding it useful to consider the practitioner's general outlook of "this is how I did it," vs. the observer's or analyst's outlook of "but how does a person do it," without falling into the trap of tossing it back into the observer's lap by saying, "well, you just do it and then you'll see."