Integrating concepts from psychology, philosophy, neurocognition, and linguistics, this book attempts to answer these complex questions. It also breaks down the cognitive-linguistic components that comprise the judgment of quality, including description, evaluation, and valuations, and applies them to issues specific to individuals with chronic medical illness.In this context, quality/QoL assessment becomes an essential contributor to ethical practice, a critical step towards improving the nature of social interactions. The author considers linear, non-linear, and complexity-based models in analyzing key methodology and content issues in health-related QoL assessment.