Aside from location and date, the style of photos required is of prime importance. Some situations require informal reportage style throughout (to provide a story) while others require a mix of these and formal, more posed shots. Even with the latter I try to vary angles and backgounds to provide variety in the images.
What format is required? I always provide digital pictures via Dropbox but back these up with DVD copies. If a client requires an album then size (A4 / A3 etc), number of shots and finish are important considerations.