Key corporate strategy decisions may include whether to enter, retain, or exit a given business; whether to pursue growth internally or externally, i.e. through alliances or acquisitions; and how to allocate resources within a portfolio. In addition to being extremely risky, these decisions must often be made based on partial or incomplete information. And of course, they involve large amounts of money, and can’t easily be reversed. In light of the above concerns, how can we ensure the quality of corporate strategy decisions?