The book describes a model of corporate culture using the twin axis of sociability (friendliness) and solidarity (sense of purpose) to creat four types of culture: Networked (high sociability, low solidarity); Mercenary (low sociablity, high solidarity); Fragmented (both low) and Communal (both high). Each type has both positive and negative attributes and in each type there is a danger that the culture can slip into the "negative form". The book goes on to discuss examples of when each type of culture might be appropriate and has an excellent, thought provoking chapter on how to move from one form to another, and how to avoid the negative forms. Although simple, this book will be extremely useful to anyone wrestling with a cultural problem and has the advantage that the authors offer practical advice on what to do. Highly recommended.