ISO 9001:2015 quality management system has become part of the requirement of all the organizations, small to large, service as well as manufacturing. Over the years, ISO 9001 QMS has evolved, as per the organizations requirement, and has become very important for improving organizations systems and processes in order to sustain competitive advantages. This book focuses on requirements and key features of ISO 9001:2015 QMS such as risk based thinking, PDCA approach, process management, and continual improvement. The readers would find it easier to understand the standard requirements and implement these in their work place. Salient features: 1. Each clause and sub clause is illustrated through block diagram for easy understanding 2. Numerous examples, case examples and case studies from different organizations both from service and manufacturing for the benefit of the readers 3. Standard requirements expressed through process approach, PDCA cycle and What-How questions 4. Pedagogical tools such as chapter objectives, audit questions, flow diagrams, learning assessments and multiple choice questions have been used. 5. Special focus on risk based thinking and documented information provided. 6. Management discussions to illustrate the clause requirements are included for better understanding and readability. The forms and formats, key performance indicators/objectives, standard operating procedures and audit requirements are included.