Collins is coauthor of Built to Last: Successful Habits of Visionary Companies (1994), the widely heralded book that was the result of a six-year research project conducted by Collins and Jerry Porras. They identified 18 companies that met their rigorous standard for long-term performance. They looked for companies that had outperformed the stock market by a factor of 15 starting from 1926. Then they went about the task of identifying what these companies had in common. Now Collins turns his attention to companies that have made the transition from "good to great." This time the findings are backed by five years of research and data analysis. Starting with every company that ever appeared in the Fortune 500, Collins identifies 11 companies that had 15-year cumulative stock returns at or below the general stock market when, after a transition point, they then demonstrated cumulative returns of at least three times the market over the next 15 years. Collins then looked for similarities among the companies. What he found would both surprise and fascinate anyone involved in management.