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Decision (Including Decision Theory)

Introduction

Most problems dealt with in the practice of psychology can be solved only by the application of a treatment, e.g. an intervention. In most cases, more than one treatment is available. The psychologist has to choose between several options. His or her choice of or decision for a certain treatment cannot be made in an arbitrary way but has to follow certain rules which are the subject of a field of study called decision theory (cf. Klein et al., 1993). In the practice of psychology, an important component of the decision rules are case-related assessment data, which are collected in the course of an assessment process. The role of assessment data in the decision-making process is the topic of this entry.

A Classification of Decisions

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