Polymers and polymeric composites are appealing for many engineering applications, from parts of aircraft, civil infrastructures, to retrofitting nuclear reactor containment concrete structures, etc. These structures experience continuous cycles of mechanical loadings, in addition to continuous exposure to hostile environments, affecting their life performance. One of the major issues related to the life performance of such structures is the lack of understanding of their durability under complex loadings (e.g. mechanical loadings, including cyclic loadings at various magnitude and frequencies, coupled with temperature fluctuations and diffusion/reactions of various substances through these structures). These complex loadings will cause material degradation at different scales, and eventually lead to structural failure. In order to address the above durability issues, we plan on organizing a workshop on Durability of Polymers and Polymeric Composites, which will be part of the NIST workshop on "Service Life Prediction of Polymeric Materials: Vision for the Future". The goal of this workshop is to bring together eminent researchers from the United States, who are actively working in the field of degradation of polymeric engineering materials. They will share recent developments in modeling and experimental understanding/assessment of the degradation and life prediction of polymers and polymeric composite structures under various mechanical loading and environmental conditions. This workshop will also facilitate a discussion on current modeling/experimental approaches and future directions and research needs related to durability of polymers and polymer composites.