[plt-scheme] forward-chaining?

I've read the term and have only a loose understanding of
the concept of forward chaining. I was presented with an
interesting problem last week of given a starting situation
of no facts, then a few facts start being presented, search
the list of rules to determine which final rule is most
completed. I know I'm not explaining this well.

I'll look for this on wikipedia. Is there a better or an
other site that discusses this?

Mike