Console app (my favorite), quick & sloppy form, MS Paint (for GUI); what works best most of the time for your standard application? why?
Which format is best for the first prototype not on paper?
development process;testing
Believe it or not, PowerPoint.I know you may laugh, and I definitely did at first, but there are a lot of great things about PowerPoint that make it a good prototype tool.Easily Deploy-Able - Everyone has PowerPoint almost, so you don't have to worry about unneeded set-up just to get someone to be able to use a prototype.Easy mock-ups - Everyone pretty much knows how to get around in PowerPoint, so it's about as easy as drawing when it comes to creating the UI fast.Interactivity - This is where it gets good.  PowerPoint lets you create links on slides that take you to another specified slide by clicking on an area.  If you use this metaphor for buttons and other links for your proposed UI, you can set a user down in front of a maximized PowerPoint presentation and have them click away as you watch and take notes.You can get add-on tools like this to make it look better.