The most successful private-equity firms regularly spearhead dramatic business transformations, creating exceptional returns for their investors. To understand how those firms do it, the authors studied more than 2,000 PE transactions over the past 10 years and discovered that the top performers' success stems from the rigor with which they manage their businesses. This article describes the 4 management disciplines vital to the success of the best PE firms. First, for each business, they define an investment thesis: a brief, clear statement of how to make the business more valuable within 3 to 5 years. The thesis, which guides all actions by the company, usually focuses on growth. PE firms know that the demonstration of a path to strong growth produces the big returns on investment. Second, they don't measure too much. They zero in on a few financial indicators that most clearly reveal the business's progress in increasing its value. They watch cash more closely than earnings and tailor performance measures to each business, rather than impose 1 set of measures across their entire portfolio. Third, they work their balance sheets, mining undervalued assets, turning fixed assets into sources of financing, and aggressively managing their physical capital. Last, they make the center the shareholder. Corporate staffs in PE firms make unsentimental investment decisions, buying and selling businesses when the price is right and bringing in new management when performance falters. These firms also keep their corporate centers extremely lean. By adopting these four disciplines, executives at public companies should be able to reap significantly greater returns from their own business units.

Too often, the board of a nonprofit organization is little more than a collection of high-powered people engaged in low-level activities. But that can change, the authors say, if trustees are willing to discover and take on the new work of the board. When they perform the new work, a board's members can significantly advance the institution's mission and long-term welfare. The authors give many examples of boards that have successfully embraced the new work. The stakes are high: if boards demonstrate that they can change effectively, the professional staff at the institutions they serve just may follow suit.