Essential Systems Analysis
The Essence of a system is "its required behavior independent of the technology used to implement the system". It is a model of what the system must do saying ideally nothing about how it will do it.
The methodology proposed that finding the true requirements for a information system entails the development of an Essential Model for the system, based on the concepts of a perfect internal technology, composed of:
- a perfect memory, that is infinitely fast and big, and
- a perfect processor, that is infinitely potent and fast.
- McMenamin, Stephen M.; Palmer, John F. (1984). Essential systems analysis. Yourdon Press. ISBN 978-0-917072-30-7.
- Yourdon, Edward (2006). Just enough structured analysis. Ed Yourdon.
- Yourdon, Edward. (1989). Modern structured analysis. Englewood Cliffs, N.J.: Yourdon Press. ISBN 0-13-598624-9. OCLC 17877629.