Use Case Extensions

Question 1

What are extensions?

Answer 1

variations at each step of a sequence that considers what might go wrong/be different

Question 2

How extensions work?

Answer 2

identify possible variations in each steps of a sequence and identify what to do to recover

Question 3

Extensions within extensions

Answer 3

for each extension condition at each step, there needs to be an extension handling step

Question 4

Extension conditions vs Extension handling

Answer 4

extension conditions point out what might go wrong. extension handling are the steps to recover from those conditions

Question 5

Guarantees or Post Conditions

Answer 5

the outcomes, what must be true after the use care has occurred

Question 6

Success Guarantee

Answer 6

if the case succeeds

Question 7

Minimum Guarantee

Answer 7

however else the use case ends

Question 8

Checking consistency

Answer 8

whether the entries on different parts of the use case template is internally consistent

Question 9

Checking completeness

Answer 9

whether there is another use case that provides the relevant data for a step