The SASIG Long Term Archiving & Retrieval (LTAR) Project developed a set of recommendations to guide companies to implement effective and efficient archival and retrieval practices. The recommendations are partitioned into four topic areas: 1) Format, 2) Process, 3) Time Period, and 4) Quality Assurance. This document addresses the set of process recommendations. In particular, this document aims to provide a company with the key activities, inputs, outputs, controls and mechanisms needed to fully support the long term archiving and retrieval of product definition information. If your company is developing products using 3D models, and asking for models and digital product data from your suppliers, then this LTAR Process Recommendation is a must read.