© 2020 (CC BY) Gerd Wagner, Brandenburg University of Technology, Germany.
The Pizza-Service-2 model is a single server queuing system model consisting of the object type PizzaService,
the event type Order, and the resource-constrained activity type MakePizza, which has the
resource role pizzaService expressing that a MakePizza activity requires a
PizzaService company as a resource.
The default scenario has a single pizza service company.