Use Cases

Question 1

Actor

Answer 1

Someone, Something with behavior

Question 2

Scenario

Answer 2

Specific sequence of actions and interactions between actor and system

Question 3

what is an Use Case?

Answer 3

Collection of related success and failure scenarios that describe an actors usage of a system to achieve a goal

Question 4

White box Use Cases

Answer 4

interaction of internals

Question 5

Black box Use Cases

Answer 5

encapsulate the system and describe only interaction with external actors

Question 6

Corporate Use Cases

Answer 6

describes a business process (usually white box)

Question 7

System Use Cases

Answer 7

performed and described with respect to the system (usually black box)

Question 8

Use Case Formats

Answer 8

• Brief (usually main success scenario)
• Casual (informell, cover varius scenarios)
• Fully Dressed (All steps and variation written in detail)

Question 9

Use Case Checklist

Answer 9

is a well-defined task: (Elementary Business Process)
- performed by one stakeholder in one place at one
time
- to model a business event
- adds measurable business value
- leaves the data in a cinsistent state
is not a single step

Question 10

Dangers of Use Cases

Answer 10

Abusing it for system design

- use cases are in the problem space