Simple heuristics that make us smart. G. Gigerenzer, P. M. Todd and the ABC Research Group (eds). Oxford University Press, New York, 1999. No. of pages 416. ISBN 0‐19‐514381‐7. Price: £14.95 (paperback). Adaptive thinking: rationality in the real world. G. Gigerenzer. Oxford University Press, New York, 2000. No. of pages 344. ISBN 0‐19‐513622‐5. Price: £32.50 (hardback) · Study