i have been trying to develop something like a quote calculator for mine, a spreadsheet they can use on a pda and just put in how many windows - which floor, how many bay windows, how many conservatory winodows, access issues, is it on a compact round etc, and get a rough orice from that, +teach them as well by taking them out a few times, and tell them to stick a few quid on if they are unsure ... its not rocket science !