Dr. Neil Clark Warren is the mastermind behind eHarmony.com--an Internet matchmaking service that encourages readers to find "true love" rather than a slew of Saturday night dates. His basic shtick is that "broad-based compatibility" is the glue for making a partnership loving and lasting. Falling in Love offers 29 "dimensions of compatibility" to consider before committing to a romantic relationship. His formula is so, well, formulaic, it threatens to take all the mysticism and romance out of finding a soul mate. That's fine with Warren, who believes that readers who screen partners for compatibility will fare much better than spirit-struck lovers who base commitments on profound immediate attraction.-á Warren begins with weeding out bad characters. "If one of the partners in a relationship lies, cheats, or steals, that bad character will eventually undermine the relationship." Even if you're not the victim of these behaviors, you will be, claims Warren. So run, don't walk from the relationship. Seems like obvious common sense. Yet advice columnist are constantly answering letters from unhappily married men and women, complaining about these very forms of broken trust.-á Warren also encourages readers to stop ignoring the early "red flags" of addictive personalities and psychological issues, such as chronic depression. Demand that the partner commit to professional help before you go any further with the relationship, he advises. Other compatibility issues include anger management, sexual passion, and family planning. While his advice is solid, it is conservative. For instance, he does not address homosexual love or allow homosexual partnering on his web site. Also, most of the discussion is geared toward traditional marriage as the final goal. --Gail Hudson

Dr. Neil Clark Warren, founder of eHarmony, has counseled thousands of singles and married couples, and has become one of America's best-known experts on singles' issues, mate selection, and developing healthy relationships. His articles have appeared in numerous journals and magazines, and he has appeared on more than 3,000 radio and television programs, such as Oprah, CNBC, CNNFN and Focus on the Family.