When people talk about 'interface design', it seems they rarely mean anything more than where on the page to place the navigation... The crux being that we all

When people talk about 'interface design', it seems they rarely mean anything more than where on the page to place the navigation... The crux being that we all assume a set of priors, and everyone asks "how do we make doing this easier?" instead of the more fundamental "what does the user want done?" I don't think that skill is necessarily related to other forms of design -- it's just a case of taking a step back.