By Jim Fitch and Holly Borden
Book Chapter. Profitable Condition Monitoring. Kluwer Academic Publishers. Editor B.K.N. Rao

Condition monitoring can be easily performed by following a few simple principles. Among these principles include monitoring two sets of conditions:
- The operating and environmental conditions that precede failure, and
- Early-stage failure symptoms
Several models are presented that show the benefits of monitoring machine conditions, as well as the consequences of ignoring them . Also discussed is the integration of both proactive and predictive maintenance techniques to extend machine life.