>That was very helpful. I'm going to use the prg method. Simpler is better.
>The only benefit to the vcx might be that I would be able to replace smaller sections of the program as the rules change -- rather than ship an entire fxp. But it is probably only marginally better and not worth the complexity of vcx creation. I didn't hear anybody say that there would be a performance benefit from the vcx approach.

I expect the prg to be more lightweight than the same class as a vcx - simply because the vcx has all the extra fields, i.e. needs to be opened as a table, which also contains the source code. A fxp is just a fxp. I know of a case where practically all the forms were redone in prgs, and the size of the exe dropped from 8 to 3.5 megs - so I figure it should be lighter. But in the case of one or just a dozen of classes, I think the difference is marginal.