Effective communication and knowledge sharing are crucial for a successful software project. Software engineers have to understand the business domain in order to design and build a software solution.

Domain-driven design’s ubiquitous language is an effective tool for bridging the knowledge gap between domain experts and software engineers. It fosters communi‐ cation and knowledge sharing by cultivating a shared language that can be used by all the stakeholders throughout the project: in conversations, documentation, tests, dia‐ grams, source code, and so on.

To ensure effective communication, the ubiquitous language has to eliminate ambi‐ guities and implicit assumptions. All of a language’s terms have to be consistent—no ambiguous terms and no synonymous terms.

Cultivating a ubiquitous language is a continuous process. As the project evolves, more domain knowledge will be discovered. It’s important for such insights to be reflected in the ubiquitous language.

Tools such as wiki-based glossaries and Gherkin tests can greatly alleviate the process of documenting and maintaining a ubiquitous language. However, the main prereq‐ uisite for an effective ubiquitous language is usage: the language has to be used con‐ sistently in all project-related communications.