Identifying core domains

When embarking on the refactoring of a monolithic application, it is common to encounter a code base that lacks clear boundaries around domain-specific areas. This is where DDD can help, but it is crucial to avoid common pitfalls, especially for first-time practitioners. One of the biggest mistakes is focusing too early on technical implementation details rather than on the business domain and its underlying logic. You learned about the complexity and problem space in Chapter 2, Understanding Complexity: Problem and Solution Space.

At this stage, the key is to prioritize business strategies. Your goal should be to deeply understand the business and its various subdomains and let that inform your design. Consider our ERP system and the Customer entity as an example. If you attempt to use a single Customer entity across multiple subdomains such as Sales, Warehouses, and Purchases, you will create unnecessary interdependencies. Changes to the Customer entity...