# Domain Expert > [!Note] > A **Domain Expert** brings deep **business knowledge** and guides the creation of a [[Ubiquitous Language]], ensuring **model fidelity** and informed **decision-making**. A **Domain Expert** is the go-to authority on a specific subdomain, possessing a profound understanding of its concepts, rules, and real-world nuances. By collaborating closely with the development team, the expert shapes and refines the [[Ubiquitous Language]] to reflect accurate terminology, preventing misunderstandings and aligning code with business intent. Their insight drives critical decisions, from defining **business invariants** to prioritizing features, and ensures that the resulting model remains faithful to the true requirements of the domain. In essence, the Domain Expert anchors the team’s work in genuine domain expertise, enabling solutions that deliver real competitive value. --- ## References - Vernon, V. (2016). _Domain-driven design distilled_. Addison-Wesley Professional. - Vernon, V. (2013). _Implementing domain-driven design_. Addison-Wesley Professional. - Khononov, V. (2021). _Learning domain-driven design: Aligning software architecture and business strategy_. O’Reilly Media. - Alammar, J., & Grootendorst, M. (2024). _Hands-on large language models: Language understanding and generation_. O’Reilly Media. - Evans, E. (2003). _Domain-driven design: Tackling complexity in the heart of software_. Addison-Wesley Professional. - Millett, S., & Tune, N. (2015). _Patterns, principles, and practices of domain-driven design._ Wrox.