Researchers, practitioners, educators and psychologists have recognized that life is full of problems to be solved and that humans are problem-solvers. The structure of this book includes six chapters. Chapter 1 addresses approaches underlying social problem-solving approach, main concepts and factors influencing an individuals performance of social problem solving. Chapter 2 presents methodological issues in social problem-solving assessment. Chapter 3 identifies interpersonal difficulties in adolescents to develop a taxonomy of adolescent interpersonal problems, while chapter 4 points to modifying an empirically supported, multidimentional model of social problem solving to design test subscales/scales and standardizing testing procedures which base on a cognitive-behaviour-analytic approach to develop test items. Chapters 5 and 6 present evidence concerning test reliability and validity and discussions of psychological testing properties, as well as implications for practice and future research.