The viable system model (VSM) is a model of the organisational structure of any autonomous system capable of producing itself - wikipedia 
A viable system is any system organised in such a way as to meet the demands of surviving in the changing environment. One of the prime features of systems that survive is that they are adaptable.
An exemplary model of a viable system. Assumption: There is one System 1 purchasing external resources and one System 1 which produces the value, delivered to the customers.
- wikimedia
The VSM expresses a model for a viable system, which is an abstracted cybernetic (regulation theory) description that is applicable to any organisation that is a viable system and capable of autonomy.
# See also - Stafford Beer - Project Cybersyn - Cybernetics * Overview * Components * Rules for the viable system * Measuring performance * Metalanguage * Applying VSM