It's principally doing something to a measure. drawing a line and then zooming in and out etc seems fairly easy, but I can't figure out the sizes, scales etc. I'm sure i'm being thick but I rarely find issues getting to grips with computer bits, but this drawing malarkey is getting to me. I was never any good at art so it might be the similarities frustrating me, when actually all I want to do is draw a box to show the size of a house and then draw on scaled internal and external walls etc etc.