Why not check out what's already on the market? I don't understand why everyone wants to reinvent the wheel.... Anyway, in the general history field I'm familiar with REGIS (out of Maine) and ARGUS (Questor out of Los Angeles) programs and can send contact information if you're interested. Also know about Willoughby Associates "SNAP" program. I'm certain other art museums would be happy to tell you what works for them, and what doesn't.