More of my notes on Udi Dahan 's podcast on - Does SOA requires ESB? Does SOA require ESB? A single system that will be divided by autonomous services. Autonomous services as opposed to simple services, that a lot of the industry is talking about, add another layer of richness into what goes into a service and what a service’s behavior is. If we were to take a concrete example of what the difference between a simple service and an autonomous services is, an example of simple service would be something