They define the results your seek, and give you something to measure your progress against. It's inevitable that to create something original and beautiful, you have to try out lots of ideas. So many in fact that you can lose sight of the problem you set out to solve in the first place. The way to stay on track is to have a clearly articulated set of goals, a Project Definition . Goals on the other hand, represent your destination.
Nothing gets the creative process off the ground like having goals defined on a piece of paper.
Begin by writing down the assumptions you're starting out with, anything you already know about your project.