use-case-diagramlisted

# PMO Skill: Use Case Diagram > **Related Skills:** Also load `pmo-lark-plantuml` when writing .puml files. > Load `references/use-case-checklist.md` for validation checklist (7 ข้อ) before finalize. Use this skill when creating PlantUML Use Case Diagrams. Save output in `./<ProjectName>/UseCase/` --- ## Pre-requisites: Ask Before Creating **Must ask the user:** - How many Actors? What are their names? - What is the System boundary name? - Are there Sub-systems? Never assume actors or use cases without asking. --- ## Syntax Reference ### Actor ```plantuml ' Keyword style actor Customer actor "System Admin" as SA ' Colon style :Customer: :System Admin: as SA ``` ### Use Case ```plantuml ' Parenthesis style (Login) (Place Order) (View Report) as UC1 ' Keyword style usecase "Place Order" as UC2 usecase UC3 as "Multi-line Use Case Name" ``` ### System Boundary (Rectangle) ```plantuml rectangle "System Name" { (Use Case 1) (Use Case 2) } ' Nested sub-system rectangle "Main System" { rectangle "Sub-system A" { (Feature 1) } } ``` ### Relationship Types | Relationship | Syntax | Line | Arrow | Label | |-------------|--------|------|-------|-------| | **Association** | `Actor -- (UC)` or `Actor --> (UC)` | Solid | Open/none | Optional | | **Include** | `(UC1) ..> (UC2) : <<include>>` | Dashed | Open | `<<include>>` | | **Extend** | `(UC1) ..> (UC2) : <<extend>>` | Dashed | Open | `<<extend>>` | | **Generalization** | `Child --|> Parent` | Solid | Filled