The Viable System Model (VSM) was developed by Stafford Beer and implemented in the CYBERRSYN project. 
It consists of 3 different states that incubate the management and dynamics of  the processes:

a: the environment of the organism.
b: the operations area.
c: the metasystem.

VSM is a model that structures the organisation of any viable system  A viable system is any organised system that combines  the survival demands in a changing environment. 

One of the primary characteristics of surviving systems is that they are adaptable to environmental conditions. Cybernetic components of VSM. 
A viable system has five subsystems that work reciprocally, and that can be identified through the diverse structural aspects of each organisation. 

To see an explanation of each level, activate the interactive VSM.