Clearly when a PC runs across an open field, it's a maneuver. But when he scrambles up a small cliff using Athletics, is it "upgraded" to an action?
When a PC uses Piloting (Space) to fly though some asteroids, can he then not use Gunnery to shoot some TIEs he's pursuing?
If, in the midst of combat, your PC wants to make a Knowledge (Underworld) check to try and figure something out about the enemy, would that use up her action for the turn?
Where's the line? When is a check
not
an action? Or is a check always an action?