The Z.151 - User Requirements Notation (URN) standard has been approved by the International Telecommunications Union's
Telecommunication Standardization Sector (ITU-T).

URN is a language consisting of Use Case Maps and GRL (Goal Requirement Language), a variant of the i* Framework.

The standard was approved at the ITU-T SG17 meeting in Geneva on November 13, 2008, together with several companion standards including Z.111, which defines the URN meta-metamodel, and Z.110 and Z.450, which both cite URN.

Thank you to everyone for their hard work in this effort.

The Z.151 draft document is available at:

http://jucmnav.softwareengineering.ca/twiki/bin/view/UCM/DraftZ151Standard

Results of the approval process:

Z.151 - User Requirements Notation (URN) - Language definition

Z.111 - Notations and Guidelines for the Definition of ITU-T Languages

Z.110: Criteria for use of formal description techniques by ITU-T

Z.450 - Quality aspects of protocol-related Recommendations