Joy talks with Vaughn Vernon about Domain-Driven Design. Vaughn shares his journey to DDD and the reasons behind his DDD books. They then go on to discuss strategic design, the broad brush strokes of DDD, what a model actually looks like and how to use bounded contexts to keep a system from becoming a big ball of mud. Vaughn then answers some questions about domain events and event sourcing, and makes a case for modelling uncertainty instead of fighting with concurrency.