Use Case (glossary)
Description of the behavioral requirements of a system and its interaction with a user. (ISO/IEC/IEEE 2011)
ISO/IEC/IEEE. 2011. Systems and software engineering: Developing user documentation in an agile environment. Geneva, Switzerland: International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC)/ Institute of Electrical and Electronics Engineers (IEEE). ISO/IEC/IEEE 26515:2011.