Personally I kind of do it like an artist, not meaning to be pretentious, but like an artist 'dabs' the spatially-defining features of a painting first, I'll co

Personally I kind of do it like an artist, not meaning to be pretentious, but like an artist 'dabs' the spatially-defining features of a painting first, I'll code or pseudo-code, first, parts that are the most 'interesting' or that I'm most uncertain about. Thus I hit the bottom places that change the design the most, early. At least that's the intent. I will still hit some unforeseen detail that knocks some larger organization out, but, I do find that defining the 'interesting' parts makes it that much easier to fill in the rest.