This book analyses the methods and outcomes of quality assurance in different fields. Chapter One reviews the concept of quality and its applications in forensic science laboratories. Chapter Two discusses the concepts around quality assurance in safety promotion to enhance the safety culture as well as practical views to make the measures taken more visible. Chapter Three identifies and develops a theoretical model of the internal quality assurance system of higher education based on a model system that explores beliefs and values of a university. Chapter Four examines quality assurance in higher education in Japan. Chapter Five addresses a new approach in quality assurance for x-ray units in medical institutions.