Most corporations are not as skilled at selling off assets as they are at buying them, often divesting at the wrong time or in the wrong way. Either is a very expensive mistake. A Bain & Company study has found that over the last 20 years, corporations that took a disciplined approach to divestiture created nearly twice as much value for shareholders as the average firm. In this article, Bain partners Mankins, Harding, and Weddigen set out the four straightforward rules those effective divestors follow. First: Just as they have acquisition teams, smart divestors have full-time divestiture groups, which continually screen their companies' portfolios for likely businesses to sell off and think through the timing and implementation steps needed to maximize value in each particular case. Second: They choose their divestiture candidates objectively. Too many firms rush to sell in economic downturns, when prices are low. Thoughtful divestors will sell only those businesses that do not fit with the corporation's core and are not worth more to themselves than they are to any other company. Third: Successful divestors consider how to structure a deal and to whom they will sell as carefully as they consider what units to sell and when. And they are as meticulous about planning the implementation of a deal as savvy acquirers are about postmerger integration. Fourth: They make a compelling case for how, and how quickly, the deal will benefit the buyer, and they make sure the selling unit's employees will be motivated to stay on and realize that value. Using these four rules, companies as diverse as Textron, Weyerhaeuser, Ford, Groupe Danone, and Roche have become "divestiture ready": consistently able to sell at the right time and in the right way to create the most value for their shareholders.

Deal making is glamorous; due diligence is not. That simple statement goes a long way toward explaining why so many companies have made so many acquisitions that have produced so little value. The momentum of a transaction is hard to resist once senior management has the target in its sights. Companies contract "deal fever," and due diligence all too often becomes an exercise in verifying the target's financial statements rather than conducting a fair analysis of the deal's strategic logic and the acquirer's ability to realize value from it. In a recent Bain & Co. survey of 250 international executives with M&A responsibilities, only 30% of them were satisfied with the rigor of their due diligence. And fully a third admitted they hadn't walked away from deals they had nagging doubts about. In this article, the authors, all Bain consultants, emphasize the importance of comprehensive due diligence practices and suggest ways companies can improve their capabilities in this area. They provide rich, real-world examples of companies that have had varying levels of success with their due diligence processes, including Safeway, Odeon, American Seafoods, and Kellogg's. Effective due diligence requires answering four basic questions: What are we really buying? What is the target's stand-alone value? Where are the synergies--and the skeletons? And what's our walk-away price? Each of these questions will prompt an even deeper level of querying that puts the broader, strategic rationale for acquisitions under a microscope.