Soft systems methodology

Soft systems methodology (SSM) is an approach to organizational process modeling (business process modeling) and it can be used both for general problem solving and in the management of change. It was developed in England by academics at the University of Lancaster Systems Department through a ten year action research program.

The methodology was developed from earlier systems engineering approaches, primarily by Peter Checkland and colleagues such as Brian Wilson. The primary use of SSM is in the analysis of complex situations where there are divergent views about the definition of the problem. These situations are "soft problems" such as: How to improve health services delivery? How to manage disaster planning? When should mentally disordered offenders be diverted from custody? What to do about homelessness amongst young people?

In such situations even the actual problem to be addressed may not be easy to agree upon. To intervene in such situations the soft systems approach uses the notion of a "system" as an interrogative device that will enable debate amongst concerned parties. In its 'classic' form the methodology consists of seven steps, with initial appreciation of the problem situation leading to the modelling of several human activity systems that might be thought relevant to the problem situation. By discussions and exploration of these, the decision makers will arrive at accommodations (or, exceptionally, at consensus) over what kind of changes may be systemically desirable and feasible in the situation. Later explanations of the ideas give a more sophisticated view of this systemic method, and give more attention to locating the methodology in respect to its philosophical underpinnings. It is the earlier classical view which is most widely used in practice.

There are several hundred documented examples of the successful use of SSM in many different fields, ranging from ecology, to business and military logistics. It has been adopted by many organizations and incorporated into other approaches: in the 1990s for example it was the recommended planning tool for the UK government's SSADM system development methodology.

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