URA User Requirements Analysis
URD User Requirements Definition
URDB User Requirements Data Base
URL User Requirements Language
user requirements behaviors
User Requirements Statements
Verification of user requirements
user requirements database
user requirements language
user requirements analysis
importance degree of user’s requirements
user-oriented requirements
USER User System EvaluatoR
User-User Signaling UUS
SSCOP User-to-User Information
User-to-User Indicators
User-to-User Information