The 5th International Congress on CondiLion Monitoring and Diagnostic Engineering Management, COMADEM, was held in Summer 1993 at the University of the West of England, Bristol. The 1994 COMADEM Conference was held in New Delhi. What is COMADEM? It is more than a conference or an exhibition. It is a whole area spanning many disciplines. It involves sensing of relevant parameters, monitoring, evaluating data, and presenting the information in the most suitable form as a basis for decisions. The concept can be applied to such diverse fields as machinery maintenance, manufacturing processes, quality assurance, repairs of electronic equipment and medical engineering. The concept is not new. Skilled and responsible operators of the past always monitored the processes and machines to be sure that the product would meet the quality criteria. In the current moves towards automation, the procedure must be made more formally. At the same time the developments in sensing technology and signal processing have opened up a wide range of possibilities.