>I've been slowly working through Codebook (and a bunch of Object Oriented programming books) trying to get a handle on building classes and OOP in general.
Paul,

Codebooks business classes can be used in a N-Tier design however not the ones that have the UI stuff added to them. To gfind out if you have a well designed business class ask yourself, can I create this class as ole public and use it in Excel to display and edit the saem data?