Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

This volume is the fruit of the 5th conference on Naturalistic Decision Making which focused on the importance of studying people who have some degree of expertise in the domain in which they make decisions. The substantive concerns pertain to how individuals and groups make decisions in professional and organizational settings, and to develop suitable methods for studying these questions rigorously.
This volume appeals to practitioners in business and government, as well as academics and students who are interested in naturalistic decision making.

Research on human judgment and decision making has been strongly guided by a normative/descriptive approach, according to which human decision making is compared to the normative models provided by decision theory, statistics, and the probability calculus. A common empirical finding has been that human behavior deviates from the prescriptions by normative models--that judgments and decisions are subject to cognitive biases. It is interesting to note that Swedish research on judgment and decision making made an early departure from this dominating mainstream tradition, albeit in two different ways. The Neo-Brunswikian research highlights the relationship between the laboratory task and the adaptation to a natural environment. The process-tracing approach attempts to identify the cognitive processes before, during, and after a decision. This volume summarizes current Swedish research on judgment and decision making, covering topics, such as dynamic decision making, confidence research, the search for dominance structures and differentiation, and social decision making.