Question $1(10$ points$)$:

The objective of this question is to practice creating UML Use Case diagrams, and become familiar

with the draw.io application.

Your Tasks

In lecture, we created a UML use case diagram visualizing a point of sale transaction. In class, we

only considered a debit transaction. For this question, you will expand upon the diagram created in

class and add a number of use cases $($as well as new actors, as appropriate$).$

In particular, you should add the following to the diagram:

$$ Add a use case that models a customer paying with a credit card. This should be very similar to

the debit card use case discussed in class

$$ For the debit and credit card use cases, model the ability for customers to tap their cards, as an

alternative to entering a PIN

$$ At the end of a transaction, the system should print out a receipt. We discussed what this would

look like in class, include this use case

In addition to adding in the use cases listed above, it is likely you will also need to add some actors,

as required by the use cases.

Evaluation

$3$ marks : Use case$($s$)$ relating to credit card support are added and correct

$3$ marks : Use case$($s$)$ for debit and credit card are adapted to support tap interaction, as an alternative

to entering PIN

$2$ marks : Use case to print receipt is added to diagram

$2$ marks : Additional actors $($primary and$/$or supporting$)$ are added to the diagram, as required by

the new use cases