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014-higher_lower/docs/uc-001/ssd.md
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Tirsvad c7164feab1 Accept UCD-001, US-001, UC-001 and SSD-001 after review
Review the use case chain for Play a Game (RC-007 to RC-010, all Go)
and accept the four documents. Update the Traceability Matrix.
2026-10-04 23:48:42 +08:00

1.8 KiB

System Sequence Diagram: Play a Game

Metadata

Key Value
ID SSD-001
CrossReference UC-001, RC-010

Version History

Date Status Author Reviewer Change Commit
2026-10-04 Deprecated Jens Tirsvad Nielsen S01 Initial version 923dde7
2026-10-04 Accepted Jens Tirsvad Nielsen S01 Accepted after review RC-010 pending

Source Use Case

UC-001 Play a Game, main success scenario. The alternative flows (invalid answer, tie, no account left) are out of scope for this diagram.

Diagram

@startuml
actor Player
participant ":System" as System
Player -> System : startGame()
System --> Player : accounts A and B
loop while the guess is right
  Player -> System : makeGuess(choice)
  System --> Player : right, score, new accounts A and B
end
Player -> System : makeGuess(choice)
System --> Player : wrong, final score
@enduml

System Operations Table

Step Message (verb phrase) Parameters Return Use case step
1 startGame none accounts A and B 1, 2
2 makeGuess choice (A or B) right, new score, new accounts A and B 3, 4, 5, 6
3 makeGuess choice (A or B) wrong, final score 3, 7

Steps 2 and 3 are the same operation; the loop shows the right-guess outcome repeating, and the last call shows the wrong-guess outcome.

Lifecycle Notes

A game starts with startGame and ends when makeGuess returns wrong; the System keeps the score and the current accounts in between.