Why broadcast, telecommunication and optical media did drive the development of MPEG-2 systems. The requirements and objectives for the initial MPEG-2 systems development. The establishment of a future proof MPEG-2 systems based infrastructure for the production, distribution and delivery of audiovisual content. The need for support of new content formats within this infrastructure, in particular the extension of the transport capabilities within MPEG-2 system streams. The role in the evolution of the MPEG-2 systems standard of standardization efforts undertaken by MPEG after MPEG-2 and the produced amendments to MPEG-2 systems.