System Analysis (glossary)
A systematic investigation of a real or planned system to determine the information requirements and processes of the system and how these relate to each other and to any other system. (ISO/IEC/IEEE 2009)
ISO/IEC/IEEE. 2009. Systems and Software Engineering - System and Software Engineering Vocabulary. Geneva, Switzerland: International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC)/ Institute of Electrical and Electronics Engineers (IEEE). ISO/IEC/IEEE 24765:2009.
For a full discussion of the role and importance of system analysis in systems engineering see the System Analysis article.