1. What kind of dungeon it is. I have three.
....> Stand-alone: is just some empty that the party can explore
....> Campaign: is a location the party can keep coming back to
....> Hook: party is there because of plot - item location, big bad hide out...
2. Theme
....> Stand-alone: What was the dungeon, a prision, a guard post, ruin?
....> Campaign: Why can the party keep coming back to this location, what makes it special? Healing waters, holy site, gold, portal, passage way, etc...
....> Hook: What sent them, what are they after, what watches it.
3. Population
....> Stand-alone: it could be anything, level driven.
....> Campaign: monsters and enounters will not change for the most part.
....> Hook: Level of character driven.