COMP201: Software Engineering I
Object Oriented Design
Coursework Assignment 2 (2021/2022)

Modelling with UML


Assessment Information

Assignment number 2 of 2
Weighting 20%
Assignment Circulated date provided to class

23/11/2021
Deadline Day & Date & Time 21st of December 2021 at 17:00
Submission Mode Electronic
Learning outcome assessed be fully aware of the principles and
practice of an O-O approach to the
design and development of
computer systems;
be able to apply these principles in
practice.
Submission necessary in order
to satisfy Module requirements
No
Purpose of assessment



Marking criteria
To assess the students ability to produce
an OO design in UML.


See end of document
Late Submission Penalty Standard UoL Policy




REPORT
Title page: put your name, your student number and the course on the first page.













TASK 1. (25%) For this task fullnshow all your working. Given the following informal
specification, identify good candidates for classes and attributes, and identify things that are
outside of the problem domain. Also identify all potential inheritance relationships. You should
ensure that data is NOT duplicated across classes even if a user places multiple bookings. Use the
noun identification method of class elicitation for the first pass.
Your customer is a travel agency that wants a reservation system that will run on the Internet.
This reservation system will allow clients to keep track of all their travel reservations for
airlines, hotel and rental cars. The client must enter the names of all his/her traveling
companions, but all reservations will be under the name of the primary client. The system
needs to make it easy for a client to have multiple reservations. All reservations will include
a booking number as well as their names, passport numbers and dates of birth of all the
travelers involved in the reservation. The system should also have an address for the primary
client. Airline reservations will include the airline, flight number, class of seat and travel
dates and times. Hotel reservations will include the type (twin, single, double) and of rooms
and the dates staying. and name and address of the hotel. Car rental reservations will include
the type of car requested, dates and the drivers’ license number of the primary client, at the
time the booking was made.
As part of your answer include;
Descriptions of each class.
A class diagram showing clearly all classes and their relationships.

TASK 2. (25%) You are required to draw a UML activity diagram to represent the following
scenario of a hairdresser’s salon.
Customers enter the salon and wait until the next hairdresser is free. They then indicate
whether they would like their hair washed first or a “dry-cut” without having their hair
washed. The hairdresser washes the hair (if asked for) and then cuts it. After finishing the
customer’s hair the hairdresser moves onto the next waiting customer, or waits for another
one to enter the salon. The customer goes to the till and waits for a cashier to be free to take
their payment. They can pay by either cash or by credit card (where they need to type their pin
into the machine or use contactless payment), they are given a receipt and they then leave the
salon.


TASK 3. (25%) Read the following passage carefully.
An employee has a name, address, phone number, date of birth and job title. Employees can be
appointed and can leave, and are either monthly paid employees or weekly paid employees.
Monthly paid employees have a bank sort code, bank account number and number of holidays while
weekly paid employees are paid in cash on a specified day of the week - their payday. Weekly paid
employees may apply to be promoted to a monthly paid employee. Monthly paid employees can take
a holiday if they have sufficient number of holidays remaining.
All employees are entitled to use the Sports Centre if they register to do so. The Sports Centre is made
up of two gyms (with a maximum capacity), three tennis courts and a bar.
The bar can be booked for special events, and has three rates of hire - a working hours' rate, an
evening rate and a weekend rate. The Sports Centre holds a list of employees who have registered.
An employee's age can be calculated from their date of birth, in order to prevent under-age drinking
at the bar.

You are required to draw a UML class diagram for the above system. All the key words you need
to include are underlined – do not invent any details additional to those given above:

1. Illustrate the various classes that exist, with their attributes and operations (including any
derived ones, represented in the usual way)
2. Mark on the relationships that exist between the classes using the standard UML symbols to
represent the type of each relationship
3. Add multiplicities
4. for any relationships of association:
a. mark on the navigability
b. appropriately name the two roles

TASK4. (25%) Draw a UML sequence diagram that specifies the following protocol of initiating
a two-party phone call. NOTE: ArgoUML does not fully support Sequence Diagrams, it may be
better to use a different program (such as OpenOffice Draw/ Microsoft Powerpoint) or (neatly) draw
the diagram by hand. Let us assume that there are four objects involved:
 two Callers (s and r),
 an unnamed telephone Switch, and
 Conversation (c) between the two parties.

The sequence begins with one Caller (s) sending a message (liftReceiver) to the Switch object.
In turn, the Switch calls setDialTone on the Caller, and the Caller iterates (7 times) on the
message dialDigit to itself. Once the digits are dialled, a finished dialing message is sent to the
switch object containing the dialled digits. The Switch object then calls itself with the message
routeCall. It then creates a Conversation object (c), to which it delegates the rest of the work.
The Conversation object (c) rings the Caller (r), who asynchronously sends the message
liftReceiver. The Conversation object then tells both Caller objects to connect, after which they
talk. Once Caller (r) sends a disconnect message to Conversation then Conversation tells both
Caller objects to disconnect and also it tells the Switch to disconnect. After that Switch deletes
the object Conversation.

All the key words you need to include are underlined – do not invent any details additional to those
given above.
Marking Criteria






Task A++ to A
70%+
B
60%-69%
C
50%-59%
D
40%-49%
E+
35%-39%
E- to G
< 35%
1 Well chosen classes for the
scenario and a description of
any removed superfluous
classes. Correct inheritance
used.
Mostly correct classes chosen
but without solid
justification. Inheritance
relations denoted correctly.
Inappropriate classes or
inheritance relations defined
with minor omissions and/or
poor justification of chosen
classes.
Major omissions of classes
and incorrectly
chosen/missing
inheritance relations.
Some understanding of
classes and how they
should be derived but
with a poor choice of
classes and no
justification
No evidence of
understanding the
concept of deriving
classes from a scenario.
2 Correct notation and a good
level of abstraction used
throughout
Mostly correct notation but
with minor errors and/or
minor omissions for the
modelling of the scenario
A good attempt to model the
scenario but with slightly
incorrect notation and an
inadequate level of detail.
Insufficient level of detail
but some evidence of
correct understanding of
activity diagrams.
Some evidence of
understanding activity
diagrams and an attempt
to model the scenario in
some meaningful way.
No serious attempt to
model the scenario with
an activity diagram.
3 Correct notation and a good
level of abstraction used
throughout
Mostly correct notation but
with minor errors and/or
minor omissions for the
modelling of the scenario
A good attempt to model the
scenario but with slightly
incorrect notation and an
inadequate level of detail.
Insufficient level of detail
but some evidence of
correct understanding of
class diagrams.
Some evidence of
understanding class
diagrams and an attempt
to model the scenario in
some meaningful way.
No serious attempt to
model the scenario with a
class diagram.
4 Correct notation and a good
level of abstraction used
throughout
Mostly correct notation but
with minor errors and/or
minor omissions for the
modelling of the scenario
A good attempt to model the
scenario but with slightly
incorrect notation and an
inadequate level of detail.
Insufficient level of detail
but some evidence of
correct understanding of
sequence diagrams.
Limited evidence of
understanding sequence
diagrams and their uses.
An inadequate attempt to
use sequence diagrams in