Have you tried the spec tool yet? It´s pretty fun. Check it out.

Our programmers are calling this the alpha version of the spec tool. We think it´s good enough to share and we know there are some bugs. You´re invited to help direct the process of improving the tool. Please share any fixes or features that you´d like to see. We´ll continue to rely on your opinions to guide future tool upgrades. Thanks for sharing your thoughts.