Unit 9

Question 1

Use case

Answer 1

A use case(a good one) typically represents a major piece of functionality that is complete from beginning to end

Question 2

Activity diagrams

Answer 2

-Graphically represents the flow of events/logic within a program(use case)
-Shows the steps of a computation
-Use case descriptors are usually written from an outside actor’s perspective
-Activity models take an inside system’s viewpoint
-Depict flow of activities in the execution of a use case
-DO NOT show object that perform the activities

Question 3

Constructing an Activity Diagram

Answer 3

-Add swim lanes for the actors and system
-Start with one initial node
-Add activities for each step in the UC narrative
-Show flows between each activity
-Add decisions,forks and joins as necessary
-End with a single end node

Question 4

Use case

Answer 4

A textual model that lists and describes the processing details for a use case

Question 5

Precondition

Answer 5

A condition that must be true before a use case begins

Question 6

Post condition

Answer 6

What must be true upon the successful completion of a use case