What are software domains?

As we discussed in Chapter 2, Non-Functional Requirements, and Chapter 3, Documenting Requirements with Azure DevOps, the transfer of knowledge from domain experts to the development team plays a fundamental role in software design. Developers try to communicate with experts and describe their solutions in a language that domain experts and stakeholders can understand. However, often, the same word has a different meaning in various parts of an organization, and what appear to be the same conceptual entities have completely different shapes in different contexts.

For instance, in our WWTravelClub use case, the order-payment and packages-handling subsystems use completely different models for customers. Order-payment characterizes a customer by their payment methods, currency, bank accounts, and credit cards, while packages-handling is more concerned with the locations and packages that have been visited and/or purchased in the past, the user’s...