Our models should be driven by the domain, but not constrained by what domain experts tell us. After all, the domain language is messy, organic, ambiguous, social, incomplete, and if it has any intentional design to it at all, it's not designed to be turned into software. Modelling is more than capturing requirements,

Over more than 15 years ago, Eric Evans published the book Domain-Driven Design. The blue book, as it is called today, has a vast amount of knowledge on software architecture. As Paul Rayner once stated 'Every new idea on software architecture; you can already find somewhere in the blue book'. Because the knowledge is