I think Jack's idea of forming a "pool of knowledge" so to speak is a good one but would be really hard to accomplish.

I thought about it in terms of what I might be able to contribute and came to the conclusion that I can't even always settle in on why I think something is a pop.The are just too many factors going into my decision,and what i am looking at changes from item to itemIt is usually a combination of things that make something just "not look right"to me.

It's just that it would be really hard for me to put down in writing years of experience when I can't even figure it out myself.And,on top of that,I've made mistakes looking at something I had in my hand!!LOL.