This report focuses on in-line cure monitoring as a key way of optimising production. The bulk of this review is devoted to coverage of the range of techniques used for cure monitoring. These have been grouped in terms of the materials properties that are followed: thermal, mechanical, electrical, and optical. Specific areas covered include process modelling, off-line cure assessment and quality assurance. In this section the author also reviews the technical and practical issues associated with the various techniques. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database gives useful references for further reading.