A unit for partitioning a larger domain (or system) model into smaller parts, each represents an internally consistent business domain area1,2.
1. Skelton, M., Pais, M. & Malan, R. Team Topologies: Organizing Business and Technology Teams for Fast Flow. (IT Revolution Press, Portland, OR, 2019).
2. Evans, E. Domain-Driven Design: Tackling Complexity in the Heart of Software. (Addison-Wesley Professional, Boston, 2004).