I've seen that thread and I know it's gotten a lot of views, but perhaps a thread title that described the problem, like Sum columns based on multiple criteria and putting that as a locked sticky in the Tips & Tutorials section (and clearing out threads that don't belong there) would work better. If we had the title of that forum amended to say "Tips & Tutorials - Check here first for solutions" or put some such note in the rules (because there are a few people who actually read them ), maybe we could help people help themselves a bit more.