Sequence Diagram
Updated 2026-09-11
INTRODUCTION
English translation pending.
CORE DEFINITION
A sequence diagram is a UML interaction diagram that displays participating objects as vertical lifelines, with messages ordered along a vertical time axis from top to bottom. Its core claim is that complex multi-object interaction is far clearer in this form than in prose, because the ordering of synchronous, asynchronous, and return messages, together with loops, branches, and concurrency frames, makes sequence and causality directly visible. The condition is that it be kept as a communication sketch rather than exhaustive code.
SCAFFOLDING EFFECT
Reduce cognitive load
- Visualize the exchange: draw lifelines and messages instead of describing interaction in prose. - Expose timing gaps: use the diagram to spot missing timeout and retry handling. - Align the team: let all sides read the same ordering before implementation.
Anchor fast decisions
Vertical lifelines represent objects and the vertical axis represents time, so the sequence and causality of messages among objects become visible at a glance, which exposes omissions and race conditions that prose hides.
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/Sequence_diagramverified
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