Managers must constantly make decisions with incomplete information and face disagreements or conflicts about the values of options and the goals to be pursued. Under pressure to make decisions, managers will often become trapped into positions they later regret, or make errors, which, in hindsight, seem avoidable. For important decisions, maintaining confidence in the analysis and being able to defend the choices made are critical to the effectiveness of a manager’s performance. In dealing with others, too, it is important to understand “what makes them click”, i.e. how they make their decisions and how their decisions can be influenced.