Throughout our lessons, Covey's presence is both learned and thoroughly appealing. He drops references to the likes of Socrates, T.S. Eliot, and Robert Frost with the aplomb of an English professor. And his knack for mixing everyday stories with abstract concepts manages to clarify difficult issues while respecting our intelligence. You could argue that the cassette is nothing more than a clever marketing tool for selling another few million copies of the book. But, even at that, it's worth the investment in time and concentration: in the end, we're moved to learn more about integrating all seven habits in our struggle to become better and, yes, more effective people. (Running time: 1.5 hours, one cassette) --Ann Senechal