Customer models
Customer is a person 6 one specific task
- arranging a vacation trip
- activity ˆ location town ˆ hotel by grade ˆ
flight ˆ public transport ˆ rented car
- arranging a business trip
- location ˆ hotel by plan ˆ flight ˆ
taxi or rented car
- getting a computer for Joe Cheap
- search CPU by price ˆ modem ˆ display
- getting a computer for Peter Fast
- search CPU by speed ˆ storage ˆ display ˆ network
- Hierarchical
- alternatives at each level ( evaluate, commit, rollback )