Chapter 5 — full chapter
5.1 GS1
Chapter 3 treated a data requirement as incomplete until it was linked to the physical carrier that would deliver it (section 3.1.2). GS1 is where that link is made concrete: it is the identification system that underpins the vast majority of product barcodes already in circulation, and it is the foundation on which the QR codes, RFID tags and resolvers discussed later in this chapter are all built. Understanding GS1 first makes the rest of the chapter easier to follow, because QR and RFID are best understood as two different physical ways of carrying the same underlying GS1 identifier.