I'll just start laying out the melody exactly where I want it to fall. And then I'll go back and fill it out. Whereas, in other pieces I'm really just going a couple bars at a time.
In some types of music I'm working out all the chords one bar at a time - the whole structure, because it's about that. And there are other pieces which are really about - okay, the melody is going to start here and play through to here.