This forum is designed primarily to discuss user interface issues independent of implementation. Important questions in this area are such things as what format to use to display multiple equations on the screen, what format the equation history should have, what different drags and drops mean, and perhaps in the long run what interface to use to allow the user to change such things as the assumptions on variables. Basically this forum is about how to make things easy and convienient for the end user, regardless of how it is implemented.