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AS educated people, we pride ourselves on our ability to think coolly and logically about the decisions we have to make. Psychologist Stuart Sutherland鈥檚 well-written and comfortably paced review, Irrationality: Why We Don鈥檛 Think Straight! (Rutgers University Press, pp 357, $24.95), challenges such complacency. He documents how even highly trained experts regularly deviate from objective standards of rationality. People misapply the principles of statistics, fail to consider all relevant information, distort facts, fall prey to a need to obey, please or conform, or, at the opposite extreme, allow drives such as jealousy and competitiveness or even fatigue and stress to pervert the reasoning process. He concludes that the only way to beat such distractions is to develop certainties about what is central to one鈥檚 own self 鈥渢o undergo a period of deliberately acting in the ways that mould one鈥檚 character to one鈥檚 desire鈥�. To take control, we have to choose objectives and principles and measure against them the desirability of the various courses of action open to us.