# Domain Driven Design ## Links * [Article by Martin Fowler: Bounded Context](https://martinfowler.com/bliki/BoundedContext.html) * [Article by Martin Fowler: Ubiquitous Language](https://martinfowler.com/bliki/UbiquitousLanguage.html) * [Article by Martin Fowler: DDD Aggregate](https://martinfowler.com/bliki/DDD_Aggregate.html) * [Pat Helland’s paper, "Data on the Outside versus Data on the Inside", talks about guidelines for designing consistency boundaries. It is essential reading for anyone building microservices-based systems](https://www.cidrdb.org/cidr2005/papers/P12.pdf) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://wiki.dmmax.me/system-design/ddd.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.