One of the last pages in every venture capitalist funding presentation is the "hockey stick" of revenues and profits shooting through the roof. VCs expect a bit of optimism from a startup, but at the same time want to do a reality check on these numbers.
I often use a company snapshot, a tree of the key factors that add up/multiply to the projected revenue figure. Make sure the factors are real things you can touch: people, visits, etc.  CORRECTION: Also make sure the tree adds up and calculates through, something that cannot be said about the example below.