Barcode-based identification methods are gaining ground in almost every manufacturing segment. Reading more than one bar code at a time is a challenging application. There is a need to read multiple codes of the same symbology, as well as multiple codes of mixed symbologies within one field of view, among other possibilities. In this white paper, Cognex shares what it has learned in order to make these applications easy after solving so many variations. Cognex also points out typical multiple code reading applications.