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I have occasionally heard the terms "process-based DES" and "event-based DES".

For example, from SimPy:

SimPy is a process-based discrete-event simulation framework based on standard Python.

Wikipedia:

The three-phase approach is a refinement of the event-based approach in which simultaneous events are ordered so as to make the most efficient use of computer resources.

Ciw also mentions something that I would infer to be potentially event-based:

Ciw uses the event scheduling approach [SW14], similar to the three-phase approach. In the event scheduling approach, three types of events take place: A Events move the clock forward, B Events are prescheduled events, and C Events are events that arise because a B Event has happened.

The citation above, [SW14], is

Robinson. Simulation: the practice of model development and use. Palgrave Macmillan, 2014.

I got my hands on that book. I've implemented the three-phase approach described there. But I am still not 100% confident in my understanding of the distinction between "event-based" vs "process-based" DES.

I have also implemented some simulations using SimPy, but again not sure why exactly it is "process-based". It also keeps a min heap of events as did the three-phase approach implementation.

Can the distinction be made explicit (and formal, if possible)?

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