The book explains the systematic structure and practical use of the new SQC application that systematically and organizationally enhances the corporate management key for the 21st century. Departing from the conventional statistical application of SQC, this book explains the SQC application for scientific problem solving and its structural framework in which SQC is utilized for discovering the cause and effect relation from the gap between a theory and the actual, eliciting a new fact and finding, and establishing a general solution that contributes to development of innovative technology. It also reports case studies in which management technology issues were solved at Toyota Motor Corporation.