Separate Houses stands out as a helpful book not only for it's easy to read advice on divorce and stepfamily situations, but for the 2 "tests" that are included. You won't find these elsewhere (at least that I know of). There is the "Divorce Destructiveness Scale" which will help parents assess how they're handling the divorce in relationship to their children and the "Custody Determination Test" that can be used as a loose guide (along with other factors) in making a parenting plan that works. Just 90 pgs. long, the book packs a lot in.