Diagnostic des défaillances is a French-language technical work on identifying and analyzing failures in industrial systems. The title indicates a focus on both the theory and practical application of fault diagnosis, making it relevant to engineering, maintenance, and industrial operations. The book addresses malfunction detection as a structured technical problem, connecting diagnostic reasoning with the realities of complex machinery, production environments, and operational reliability. With a substantial length of more than six hundred pages, the volume appears to offer broad coverage of methods, concepts, and applied practices for understanding system breakdowns. It is suited to engineers, maintenance specialists, and researchers concerned with safety, dependability, and the continuity of industrial processes. The work functions as a specialized reference for diagnosing equipment failures and interpreting technical evidence in complex systems.