I've seen Sylvia Rimm's work on underachievement mentioned several times here. I had a look at her website, and there seem to be a lot of different books, workbooks, cassettes, etc.

Does anyone have a recommendation? I'm thinking of purchasing the book (why smart kids get poor grades) or the work-book (causes and cures for underachievement, or something like that).

I took her short on-line quiz, and confirmed that I have a "dominant underachiever" on my hands in DS11 (which I pretty much knew, but didn't have a name for it).