For those receptive to prescriptions for building or rebuilding relationships, psychologist Block (To Marry Again, Friendships) offers another reliable array. The Block ""program of hard work"" for problems in such areas as negativity, sex, communication, and conflict even includes ""corrective prescriptions"" to change readers' destructive orientations. We start with a ""relationship-enhancement inventory"" that measures the health of the relationship in three of those areas. Then begin the specific ""Relationship Principles,"" which embody sound basic psychology--principles, for instance, of trust, empathic listening, direct (unambiguous) communication, and compromise. Typical of the solutions is the well-known ""I Message"" Principle: communicate dissatisfaction not by accusing your partner, but by expressing your own inner feelings. In the area of conflict resolution, Block borrows profitably from the business world; among other things, he recommends brainstorming, problem definition, and clarification/summarization of the final agreement. When problems seem insurmountable, professional help should be sought (but with care--in unskilled hands, therapy can be a ""negative experience""). Thoughtful tips for the practically inclined.