Before you make that big decision..

When an executive makes a big bet, he or she typically relies on the judgment of a team that has put together a proposal for a strategic course of action. After all, the team will have delved into the pros and cons much more deeply than the executive has time to do. The problem is, biases invariably creep into any team's reasoning-and often dangerously distort its thinking.

Deals without delusions.

Pursuing a merger or acquisition is inherently difficult. Things get even harder when executives are blind to their own faulty assumptions, say Lovallo--a professor at the University of Western Australia Business School and a senior adviser to McKinsey--and three of his McKinsey colleagues. The authors identify biases that can surface at each step of the M&A process and provide practical tips for rising above them--an approach they call targeted debiasing.

Delusions of success. How optimism undermines executives' decisions.

The evidence is disturbingly clear: Most major business initiatives--mergers and acquisitions, capital investments, market entries--fail to ever pay off. Economists would argue that the low success rate reflects a rational assessment of risk, with the returns from a few successes outweighing the losses of many failures. But two distinguished scholars of decision making, Dan Lovallo of the University of New South Wales and Nobel laureate Daniel Kahneman of Princeton University, provide a very different explanation.