Use Case Diagram
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
A graphical representation of the actors of a system and their relationships with the system's functions (use cases), describing "who uses the system to do what". Scaffolding role: boundary clarification. In the early stages of a project, it clarifies the system scope and user expectations, providing a consensus baseline for subsequent design.
SCAFFOLDING EFFECT
Reduce cognitive load
Boundary clarification. In the early stages of a project, it clarifies the system scope and user expectations, providing a consensus baseline for subsequent design.
Anchor fast decisions
A use case diagram is a UML behavioral diagram that uses actors, use cases, and their relationships to describe system functions and external interactions, focusing on answering what the system does rather than how it does it.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Use_case_diagramverified
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