Sociologist Yager (Friendshifts) has been studying and writing about friendship since the 1980s. Drawing on the results of 180 questionnaires, as well as earlier studies she conducted, Yager focuses here on what to do when friendships go bad. Successful friendships, according to Yager, are marked by trust, honesty, empathy and commonality—characteristics that may be compromised when a once-supportive relationship turns sour. When this happens—as it inevitably does in the course of one's life—friends may become self-absorbed, overly dependent, highly critical or even betray one another. Underlying childhood issues, such as low self-esteem, intense sibling rivalry and abusive parenting often prevent adults from forming satisfactory friendships. The author outlines a variety of coping techniques that committed friends can follow as they work through negative patterns that are eroding their relationship. She also explains how to recognize a friendship that is so destructive it must be ended (e.g., if a friend isn't there for you when your parent dies, it's a sign the friendship's over), how to actually end the friendship (try saying "I'm busy" when the friend asks to get together), how to detect "harmful" people before you become friends with them (examples are the "taker" and the "one-upper") and how to deal with friendships at work (Yager is convinced these friendships should remain casual). This valuable book will be a rescuer to all readers struggling to deal with an ailing friendship. (July)