Modules

Modules are the best way to separate related business objects. These are best suited to large projects where the size of domain objects is bigger. For the end user, it makes sense to divide the domain model into modules and set the relationship between those modules. Once you understand the modules and their relationship, you start to see the bigger picture of the domain model, thus it's easier to drill down further and understand the model.

Modules also help with code that is highly cohesive, or that maintains low coupling. Ubiquitous language can be used to name these modules. For the table-booking system, we could have different modules, such as user-management, restaurants and tables, analytics and reports, reviews, and so on.