 Concurrently, an International Networking Working Group formed in 1972, led by Cerf; active members included Alex McKenzie, Donald Davies, Roger Scantlebury, Louis Pouzin and Hubert Zimmermann.The specification of the resulting protocol, the Transmission Control Protocol (TCP), was published as by the Network Working Group in December 1974.It contains the first attested use of the term "internet", as a shorthand for "internetwork".