Lecture 3

Question 1

how are actors represented in use case diagrams? and primary/secondary use case

Answer 1

-actor is person or system that interacts with system through one or more use cases, -> system actor, -primary actor initiates use case (customer initates place order use case), -secondary actor participates in use case (> participates in place order case)

Question 2

explain include and extend in terms of use case diagrams

Answer 2

include - if use case contains another use case completely (cancel booking includes display booking)
extend - if use case can sometimes use other use case (process payment may include credit card) recommended way of wording it is process payment conditionally includes process credit card

Question 3

difference between business, system and sub function use cases

Answer 3

system use case - preformed in 1 sitting (else it business)
-would you do it all day? (if not subfunction)
-can you take a break after use case? if no subfunction
eg business handle claim, subfunction login

Question 4

what are functional requirements?

Answer 4

inputs outputs and changes of state. UI is not a functional requirements so not a use case but sketches can be included. add non-functional requirements to description if needed?