025-squirrel/docs/domain-model.md

Domain Model

Metadata

Key	Value
ID	DM-002
CrossReference	UC-001, UCD-001, SSD-001, DICT-001
Language	en
Domain	it

Version History

Date	Status	Author	Reviewer	Change	Commit
2026-10-13	Accepted	Jens Tirsvad Nielsen	AI as stand-in for S01	Initial version	259d017

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Purpose and Scope

Covers: UC-001 Count squirrels by fur colour.

Diagram

Concepts, attributes and associations only — no operations.

@startuml
class Participant
class "Census file" as CF {
  name
}
class "Squirrel sighting" as SS
class "Fur colour" as FC {
  name
}
class "Colour count" as CC {
  number of sightings
}
class Summary
class "Summary file" as SF {
  name
}
Participant "1" --> "1" CF : supplies
CF "1" --> "0..*" SS : contains
SS "0..*" --> "0..1" FC : has
CC "0..*" --> "1" FC : counts sightings of
Summary "1" --> "3" CC : consists of
Summary "1" --> "1" SF : is written to
Participant "1" --> "0..*" Summary : receives
@enduml

Concept Table

Concept	Definition	Attributes	Source (use case / glossary)
Participant	The course participant who runs the program	-	UC-001 primary actor
Census file	The file with the 2018 squirrel census	name	UC-001 step 1, DICT-001
Squirrel sighting	One recorded observation of one squirrel	-	UC-001 step 2, DICT-001
Fur colour	The primary fur colour of a squirrel: Gray, Cinnamon or Black	name	UC-001 step 2, DICT-001
Colour count	The number of sightings with one fur colour	number of sightings	UC-001 step 4, DICT-001
Summary	The table of colour counts	-	UC-001 step 3, DICT-001
Summary file	The file the summary is written to	name	UC-001 step 1, DICT-001

Association Table

From	Association (reading direction)	To	Multiplicity
Participant	supplies	Census file	1 to 1
Census file	contains	Squirrel sighting	1 to 0..*
Squirrel sighting	has	Fur colour	0..* to 0..1
Colour count	counts sightings of	Fur colour	0..* to 1
Summary	consists of	Colour count	1 to 3
Summary	is written to	Summary file	1 to 1
Participant	receives	Summary	1 to 0..*

Generalizations

None.

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