1. Object Oriented Analysis and Design
COM327 week 8
COM252 week 2

2. Requirements Analysis What to build? Domain Analysis Identify
use-case
analysis
Requirements
Analysis
What to build?
problem
statement
system
charter
requirements
description
object
spotting
Domain
Analysis
Identify
data/functions/
relationships
candidate
class list
CRC analysis
CRC cards
class list
System
Design
Booch diagramming
Decide on
data structures/
functionality
Booch class
diagram
JSP diagramming
complete
design
implement
C++

3. Problem Statement -example
Lecturers often miss appointments to see students because they forget that their availability slots have been booked. Their slots can change on a day to day or week to week basis making them difficult to remember. Appointments are booked by reception but not always communicated to staff.

4. System Charter - example
The system will keep track of staff availability slots.
The system will accept bookings of staff availability slots by students and automatically inform staff by sending an message at the time of booking and 10 mins before the appointment as a reminder.

5. Use-case analysis Imagine the system is finished.
Imagine you are a user.
Describe how you would do one single operation with the system:
What options would you select?
What data would you put in?
What info would you get out?

6. Use-case analysis No “repeats” - only a single operation.
No “ifs” - describe what it will do in any given instance.
Do the ordinary situations first, worry about special cases 2nd.
a.k.a. “Critical Path Analysis” ?
Now do that for ALL possible operations.
The set of use cases is your requirements statement.

7. Use-case analysis - example
Start appointment system
enter lecturer name
see weeks availability slots
enter a booking
enter time
enter student name
enter subject of appointment
exit system

8. Object Spotting Take all documents underline all nouns
problem statement
system charter
requirements description
underline all nouns
forms “candidate class list”
underline all verbs
candidate “operations list”

9. Object Spotting- example
Lecturers often miss appointments to see students because they forget that their availability slots have been booked. Their slots can change on a day to day or week to week basis making them difficult to remember. Appointments are booked by reception but not always communicated to staff.

10. Object Spotting- example
Lecturers often miss appointments to see y because they forget that their availability slots have been booked. Their slots can change on a day to day or week to week basis making them difficult to remember. Appointments are booked by reception but not always communicated to staff.

11. Candidate class list Lecturers week appointments students reception
availability slots
slots
day
week
reception
staff.

12. filter - throw away
duplicates
synonyms
anything obviously irrelevant

13. Candidate class list Lecturers appointments students
availability slots
day
week reception

14. The End!

15. Next stage
The candidate class list forms the input to the next stage -
CRC analysis
Class
responsibility
collaborator