Collins and his research team studied companies that made the leap from good to great and compared them to good companies to identify differences. They found the most important factor was sustained success and growth that outpaced peers. Example companies that made the leap included Abbott, Fannie Mae, and Walgreens. Key factors included having disciplined people and thought and Level 5 leadership, which prioritized the long-term success of the company over personal gain. Great companies also approached problems and new technologies with careful deliberation and existed for a higher purpose than just profits.