This book presents the situational theory of problem solving (STOPS). This situational theory describes human problem-solving approaches that people adopt in dealing with almost any kind of life problem. In this book the authors construct and present a theory that hinges on problem and problem-solving approaches. In addition to the theory-building concern, the authors pay attention to the ubiquitous notion of problem solving in human life. They focus their theory on communicative behavior and cognitive strategies purposely adopted to overcome problematic states that one subjectively perceives. Thus, their account focuses on the problem-solver 's perceptive, cognitive and communicative bases, when one encounters a problematic situation.