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BIAN Service Domains are modelled using a capability based approach where a Service Domain defines the fixed or enduring capacity to perform some kind of function that can be invoked as needed when some business event occurs. That same capability may be invoked by many different business events as appropriate. An analogy is the model views of a city – the dynamic process view defines a specific journey journey or ‘day-in-the-life’ of an inhabitant travelling through the city, the static capability view defines the buildings and facilities making up the city that can support any possible day-in-the-life behavior.