Drawing upon a six-year research project at the Stanford University Graduate School of Business, James C. Collins and Jerry I. Porras took eighteen truly exceptional and long-lasting companies and studied each in direct comparison to one of its top competitors. They examined the companies from their very beginnings to the present day -- as start-ups, as midsize companies, and as large corporations. Throughout, the authors asked: "What makes the truly exceptional companies different from the comparison companies and what were the common practices these enduringly great companies followed throughout their history?"

The summary is concise, but covers all the relevant learning from the book.