ITSO was established as a result of discussions between various UK passenger transport authorities concerning the lack of standards for interoperable smart card ticketing. These discussions grew to include other authorities, transport operators and government. ITSO membership covers the breadth of the transport sector including transport operators (bus, tram and train operating companies), suppliers to the industry, local authorities and public transport executives. Supported by the Department for Transport, ITSO has links with major transport industry organisations and established smart card schemes in the UK and overseas.