"If your model is telling a story, the MODULES are chapters." #readingToday

Like everything else in a domain-driven design, MODULES are a communications mechanism. The meaning of the objects being partitioned needs to drive the choice of MODULES. When you place some classes together in a MODULE, you are telling the next developer who looks at your design to think about them together. If your model is telling a story, the MODULES are chapters. The name of the MODULE conveys its meaning. These names enter the UBIQUITOUS LANGUAGE.

Domain-Driven Design, Eric Evans