Z User Group
group to promote the Z notation

The Z User Group (ZUG) was established in 1992 to promote use and development of the Z notation, a formal specification language for the description of and reasoning about computer-based systems. It was formally constituted on 14 December 1992 during the ZUM'92 Z User Meeting in London, England.
Meetings and conferences
In 1985, the Z Users Meeting series was instigated by Ib Holm Sørensen (1949–2012), initially at Rewley House in Oxford. In 1991, the meeting moved to be organized by the University of York. From 1992, on its establishment, ZUG continued this series as a regular Z User Workshop (aka Z User Meeting, ZUM), approximately every 18 months initially. From 2000, these became the ZB Conference (jointly with the B-Method, co-organized with APCB), and from 2008 the ABZ Conference (with abstract state machines as well). In 2010, the ABZ Conference also includes Alloy, a Z-like specification language with associated tool support.
In 1999, the Z User Group participated in the FM'99 World Congress on Formal Methods in Toulouse, France. The group and the associated Z notation have been studied as a community of practice.
List of proceedings
The following proceedings were produced by the Z User Group:
Bowen, J.P.; Nicholls, J.E., eds.
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