Personality assessment is the determination and evaluation of personality attributes by interviews, observations, tests, or scales. What, then, are the common properties of assessment, regardless of which area is examined? It is proposed that there are three common denominators: (a) Decisions, (b) Procedures, and (c) Data acquisition. In general, assessment may be defined as a procedure whereby data is collected for decision-making purposes. Specifically, then, psychological assessment is a procedure whereby data is collected for making decisions about people. Such a definition. although short and simple, has a major advantage in emphasising the role of decision-making in assessment. This book presents the latest research developments in the field.