ABSTRACT
This conclusion presents some closing thoughts on the key concepts discussed in the preceding chapters of this book. The book limits the term irrationality to involve judgments and reasoning that lead to contradictions, and hence to error. Other authors often use the term in a much broader manner—for example, to mean that an individual is not behaving or thinking in a manner that is likely to achieve that individual's goals, or in a more extreme definition, to characterize somebody who is not behaving in an optimal manner to achieve these goals. In contrast, the book gives a definition based on what most psychologists and philosophers term coherence. Often, people object that this type of coherence should not be the only criterion on which to evaluate the validity of a judgment or decision. The book discusses, there exists a special "expert rationality" that is different from the rationality, it is limited to a very few superb experts.
