This book explores the principles and practices of concurrent engineering, focusing on the integration of cost, time, and quality management in product development. Written in French by Patrick Jagou, it provides a systematic approach to optimizing engineering processes through parallel task execution and cross-functional collaboration. The text addresses methodologies for reducing development cycles while maintaining high standards of quality and efficiency. It serves as a practical reference for engineers, project managers, and industrial designers seeking to implement concurrent engineering frameworks in manufacturing and systems design contexts.