Visualizing your idea on paper is one of the fastest, most effective ways to take your first steps to prototyping. When you try to visualize your idea, you'll immediately encounter important choices that may have been hidden when you were still thinking about it in an abstract way. By sketching, it becomes possible to explore these choices and their consequences as a first step towards a real (or paper) prototype. And the good thing is: you don't need to be great at drawing to use it!