edVirtus Reference

What Is Soft Systems Methodology?

Soft Systems Methodology: Learning in Complex Human Situations

Soft Systems Methodology, or SSM, is an approach for exploring problematic situations in which people disagree about purposes, boundaries, and the nature of improvement. It was developed by Peter Checkland through action research in organisations.

SSM distinguishes a real-world situation from conceptual systems used to think about it. The models are not descriptions of an objectively existing social machine. They represent coherent purposeful activities viewed from an explicitly stated perspective.

Common activities include developing a rich picture, identifying relevant worldviews, formulating root definitions, and constructing conceptual activity models. CATWOE prompts consideration of customers, actors, transformation, worldview, owners, and environmental constraints.

Participants compare conceptual models with the situation to structure questions and debate. Differences reveal assumptions, accommodations, and opportunities for change. The aim is learning and feasible improvement rather than mathematical optimisation of an agreed system.

SSM can be iterative and flexible rather than a rigid sequence. Its quality depends on inclusive inquiry, careful facilitation, and willingness to examine power. A neat model can be misleading if important voices or consequences are excluded.

The method is valuable in management, information systems, policy, engineering, and community settings. It helps decision-makers resist premature solution design by asking whose situation is problematic, from which worldview, and what change could be both desirable and practicable.