The sunk cost fallacy is the tendency to continue an endeavour once an investment in money, effort, or time has been made. We studied how people's chronic orientation to cope with failing projects (i.e., action vs. state orientation) influences the occurrence of this sunk cost effect. We found...

In the current paper we investigate how feedback over decision outcomes may affect future decisions. In an experimental study we demonstrate that if people receive feedback over the outcomes they obtained (``factual outcomes'') and the outcomes they would have obtained had they decided...

Why do interactive brainstorming groups perform so much worse than individuals working as nominal groups? This was the original question, which stimulated three decades of research, as described in this chapter. Three different phases in brainstorming research can be distinguished, each of which...

Why do interactive brainstorming groups perform so much worse than individuals working as nominal groups? This was the original question, which stimulated three decades of research, as described in this chapter. Three different phases in brainstorming research can be distinguished, each of which...