More than 15,000 hours of research work went into this book, and it has really paid off. This is a well written summary of the key differences between 11 "good-to-great" companies and "direct comparison" companies. Collins and his team identify seven key areas in which the "good-to-great" companies siginificantly differ from their "direct comparison" competitors. Some of their insights are surprising: e.g. "good-to-great" companies usually do not have well-known leaders. Although the book is primarily academic and based on data, it is a good reading also for the practitioner who is not that interested in all the details of the research work. If you are, however, interested in the details of the methodology - Collins describes it in quite some detail in the appendices. In summary, this is one of the best books I know that is suitable both for a business and an academic audience.