IEC TS 62239-2:2017(E) applies to the development of COTS assembly management plans for the integration and management of electronic COTS assemblies in electronic systems used in the ADHP markets where reliability is generally critical. Depending on program or product line requirements and/or the technical characteristics of the electronic COTS assemblies and in agreement with the customer, the electronic COTS assembly management plans could consider tailoring the requirements of this document. Although developed for the avionics industry, this document can be applied by other high performance and high reliability industries at their discretion.