This document shall be used when there is a need to standardise a SWIM Service and a common understanding has been reached on the substantial functions of the service, the operational context and the information to be exchanged. This document is meant to provide an easy to understand method and a template to create SWIM Service Specifications. ED-294 is accompanied by Supplementary Material which is available for download. The link is contained in the Foreword. The Template mentioned above is part of the Supplementary Material.