Related terms for Complex Adaptive Systems (CAS), within their particular contexts:

• "socio-technical systems",
• "system of systems" (e.g. as part of systems engineering and management),
• more broadly, "complex adaptive systems" - describing the interactions of people (or "agents") and systems
• systems vulnerable to disruption (organisations, associations, all endeavours),

Systems in this broad context  may for example refer to: 

• markets and similar constructs
• engineering infrastructure, physical systems 
• information or data systems and procedures,
• projects 

extending to:

• ideological movements and institutions, 
• conceptual frameworks such as plans, strategies, processes, agreements, rules, markets
• ecologies or natural systems generally,