During the period that elapsed between the second edition and the date of writing of this third edition, the author shifted his career from a full-time molder to a full-time Consultant/ Expert witness/Educator. The opportunity existed for analyzing numerous plasticpart- related premature failures. Failure analysis and testing go together. In order to analyze the failure, it is often necessary to conduct tests. In this third edition, therefore, the decision was made to expand the current chapter on failure analysis substantially and alter the title of the book to Handbook of Testing and Failure Analysis to refl ect the change appropriately