how much?!?!

Percentages are interesting. Mathematics is interesting. Numbers are interesting. We communicate through numbers. 1 > 0 and 1 < 100

GD: What do you think of the project so far?
MB: I'm not sure. Looking at the situation, where do you think we are at? 0 being its worst and 100 nailing it on the head.
GD: I reckon, 27%
MB: 27%!! Wow, that's kinda low. Don't you believe in the project?
GD: I do but I'm still unsure of the unknown variables. I would prefer the project brief to be tighter and I would like to know the budgets you're thinking of. What about you?
MB: I was thinking more in the lines of 52%.
GD: 52% eh? Are you sure?
MB: Second thoughts, I think 74% is a better assessment of the work.
GD: Well, in that case, I guess I better deliver the goods. I'll get the drawings to you by the end of the week, shall I?
MB: That would be great. Meanwhile, I'll get more information for you to work with. I need you to believe that this idea can work. If you need anything else, call me and I'll get my secretary to send you the information you need.
Thanks GD.
GD: Thank you!

You'll notice from the script above, especially dealing in Architecture, our most valuable lesson in conversing with clients is to control their expectations. There is nothing worse than a client with unrealistic expectations. Eventually, you'll get fucked and there is no one to blame but you. But if you're able to limit their hopes, the gratification after signing the finished project over is worth more than you can ever imagine for both you and your client.