Første skridt i udarbejdelsen af en TSI er, at Den Europæiske Sammenslutning for Jernbaners Interoperabilitet (AEIF), der er udpeget som det fælles repræsentative organ, laver et udkast.
The first step in establishing a TSI is to have a draft TSI drawn up by the European Association for Railway Interoperability (AEIF) which was appointed as the joint representative body.