Recommendation ITU-T Z.151 defines the User Requirements Notation (URN) intended for the elicitation, analysis, specification and validation of requirements. URN combines modelling concepts and notations for goals (mainly for non-functional requirements and quality attributes) and scenarios (mainly for operational requirements, functional requirements and performance and architectural reasoning). The goal sub-notation is called goal-oriented requirements language (GRL) and the scenario sub-notation is called use case map (UCM).
ITU-T Z.151-2012 Referenced Document
ITU-T T.55-2008 Use of the universal multiple-octet coded character set (UCS) (Study Group 16)
ITU-T Z.104-2011 Specification and Description Language – Data and action language in SDL-2010 (Study Group 17)
ITU-T Z.111-2008 Notations and guidelines for the definition of ITU-T languages Study Group 17
ITU-T Z.150-2011 User Requirements Notation (URN) – Language requirements and framework (Study Group 17)
ITU-T Z.151-2012 history
2012ITU-T Z.151-2012 User Requirements Notation (URN) – Language definition (Study Group 17)