Anyone who thinks the audiocassette adaptation of Stephen Covey's bestseller, The 7 Habits of Highly Effective People, is a shortcut to reading the book has another thing coming. As a preview, the cassette is worth every one of its 90 minutes; as a substitute for the original, it will only leave you wishing for the rest. There's a reason 7 Habits has sold more than 5 million copies and been translated into 32 languages. Serious work has obviously gone into it, and serious change can likely come out of it--but only with constant discipline and steadfast commitment. As the densely packed tape makes immediately clear, this is no quick fix for what's ailing us in our personal and professional lives.