While I agree with the pen, paper, and whiteboard crowd, I also do most of it in my head. If the idea is too complex to hold its basic design in my mind, or I

While I agree with the pen, paper, and whiteboard crowd, I also do most of it in my head. If the idea is too complex to hold its basic design in my mind, or I am not passionate enough about it to put in the thoughts, then it isn't worth the trouble anyway.