Editing Soft systems methodology (section)

==Human activity system==
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A human activity system can be defined as "notional system (i.e. not existing in any tangible form) where human beings are undertaking some activities that achieve some purpose".<ref>{{cite book |last=Patching |first=David |date=1990 |title=Practical soft systems analysis |location=London |publisher=Pitman |isbn=0273032372 |oclc=22240151}}</ref>

Within most systems there will be many human activity systems integrated within it to form the whole system. Human activity systems can be used in SSM to establish worldviews (Weltanschauung) for people involved in problematic situations. The assumption with all human activity systems is that all actors within them will act accordingly with their own worldviews.