A number of detailed case studies in plastic failure analysis are presented. These examples span a wide variety of polymer types, industries, and failure modes. The case studies illustrate the use of fractography, as well as other complementary techniques such as fracture mechanics, stress analysis, material characterization, exemplar testing, and nondestructive test methods, in identifying the root cause. The use of these case studies and other literature as part of a regular and systematic peer review process within a root cause failure analysis is also discussed.