Activities performed to ensure that a product or service remains operational. (ISO/IEC 2009, 1)
ISO/IEC. Systems and Software Engineering Vocabulary (SEVocab) - ISO/IEC 24765. in International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC) [database online]. Geneva, Switzerland, 2009 [cited December 21 2009]. Available from http://pascal.computer.org/sev_display/index.action.