Room 6 of 10
One person, roles in context
Our question
Who was Maria in this purchase?
Back at Harbor Coffee
Maria finished her shift at 10:00. At 10:15 she bought a latte and muffin. In that purchase she participated as a Customer. Her employment did not disappear, and the purchase did not create a new person.
Time and context matter when a report asks who did what. A permanent role label is not proof of participation during a particular period. Keep the activity that supports the claim.
Try a modeling decision
What identity should the purchase use?
Choose a view to see what it makes visible.
On the whiteboard
- Purpose → Who was Maria in this purchase?
Read the worked explanation
Use the same Maria identity and connect the purchase to her customer role in that activity. Record the shift separately when it matters to the question.
Room not yet explored. Capstone progress is separate.
Inspect the source
One Maria, two roles
Participant accountsupportedMaria finished her shift at 10:00 and bought food at 10:15. It is the same person; Customer is her role in this purchase.
Employment and purchase in the fictional story.
Name the concept
Role: How a person or thing participates in a context, such as Maria acting as a Customer.
Event / transaction: An event is an occurrence, such as Order Placed. A transaction records an agreed unit of activity; its boundary and completion need a definition.