The purpose of this document is to provide guidance to Air Navigation Service Providers (ANSPs) and their suppliers on addressing the objectives of CAP 670 SW 01 (Reference 1) when deploying COTS equipment. This Guidance only addresses the safety assurance required by SW 01 for the software content of Commercial Off The Shelf (COTS) equipment. It therefore does not replace the need to demonstrate satisfaction of the System Safety Requirements in the manner required by the ANSP’s Safety Management System (SMS) or as specified in the applicable contract for equipment supply.