The Systems Thinking cluster

Ways of seeing systems whole.

Why these together

Tavistock named the sociotechnical insight. Cybernetics formalised it (Ashby, Beer). Forrester gave it modelling tools. Senge popularised it. Cynefin distinguishes the problem types. ToC focuses on constraints. Wicked Problems acknowledges the limits. Together they cover the main schools of systems thinking as they apply to software organisations.

Principle Sociotechnical Systems Work systems have a technical subsystem and a social subsystem. Both must be designed together. Optimising one without the other produces worse outcomes than balancing both.
Law Ashby's Law of Requisite Variety Only variety can absorb variety. A controller must be able to handle at least as many distinct states as the system it is trying to control.
Framework Beer's Viable System Model A model for designing organisations that can survive and adapt. Five interdependent systems handle operations, coordination, control, intelligence, and identity.
Framework System Dynamics A way of modelling systems made of stocks, flows, and feedback loops. The behaviour of a system over time follows from its structure, not from individual events.
Framework The Fifth Discipline Systems thinking, personal mastery, mental models, shared vision, and team learning. The five disciplines of an organisation that can learn.
Framework Cynefin Five kinds of situation: clear, complicated, complex, chaotic, and confused. Each one needs a different response.
Framework Theory of Constraints The speed of any system is set by its slowest part. Improving anything else makes no difference.
Framework Wicked Problems Problems where the problem statement, the solution, and the evaluation are all contested and interdependent. There is no stopping rule. Every attempt at solution changes the problem.