The ITLJ Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to
ITU-T F.901-1993 history
1993ITU-T F.901-1993 USABILITY EVALUATION OF TELECOMMUNICATION SERVICES Study Group 1