Interesting topic...
In first place I ask to the client his experience, and beside this, I prefer using different sizes in order to taste the skills of him.
Unfortunately, so far I have not met yet a "virgin" client, so I do not know how to manage it in this case.
Anyway this topic has driven me to open a new one...
http://www.saafe.info/main/index.php?topic=11675.msg92692#msg92692