Explains how to use the system of the Enneagram to develop positive business relationships and to enhance one's power and success in the workplace, defining nine types of people and their styles of management, decision making, conflict resolution, and more. 50,000 first printing.
A good "how to get along with people at work" sort of book, it also included interesting information about the nine Enneagram types. For instance, when I tell stories about my childhood my mother always says, "Why do you always remember the bad things?" Whichsurprises me, as I don't think the story in question is particularly "bad". It turns out that "eights" (of which I am one) have a whole narrative structure based on overcoming struggle. So while I've just told a great story about my triumph over whatever, my mother hears me complaining about my childhood. That was well worth the price of the book alone. (Although, full disclosure, I got it from the library and didn't pay anything.)
A great book if you are at your wit's end with dealing with someone at work, or in your life in general.