In What Really Works, William Joyce, Nitin Nohria, and Bruce Roberson put forth findings based on the Evergreen Project, a massive five-year study in which consultants and business school professors at top universities around the country analyzed ten years of data on 160 companies and more than 200 management practices. The authors discovered that all successful companies simultaneously master six specific management practices. These include four primary practices--Strategy, Execution, Culture, Organization--and any two of four secondary practices--Employee Talent, Leadership and Governance, Innovation, and Mergers and Partnerships.