1. Chris Russell O2.41 02920 41 6431 crussell@cardiffmet.ac.uk
Business Analysis
Sequence Diagrams
Chris Russell
O2.41
Lecture BA17 Sequence Diagrams

2. Lecture BA17 Sequence Diagrams
Session schedule
Business Analysis Schedule
Academic Year
Semester 2
Week
Topic 1
Introduction 2
Investigate situation: rich picture, context diagrams 3
Consider perspectives: types of participation, CATWOE, Power-Interest, Thomas-Kilmann 4
Analyse needs 1: Use Cases 5
Analyse needs 2: structured techniques 6
Define requirements 1a: SSADM 7
Define requirements 1b: SSADM
EASTER 8
Define requirements 2: UML 9
Generic assignment feed-forward and task review 10
Balance good enough software against quality costs; Prioritise requirements 11
Assignment submisison
Lecture BA17 Sequence Diagrams

3. Activities and Paradigms
Investigate Situation
Consider Perspectives
Analyse Needs
Define Requirements
Socio-technical
Rich picture
CATWOE
Types of participation
Thomas-Kilmann
Power-Interest X
Functional
Level 0 diagram
Structured techniques
DFD, ERM and ELH
Object-Oriented
Context diagram
Use Cases
Class and Sequence diagrams
Lecture BA17 Sequence Diagrams

4. Lecture BA17 Sequence Diagrams
Client’s use cases
Lecture BA17 Sequence Diagrams

5. Detail of Subscribes address
Actor: Client
Standard Scenario:
The client views the list of subscribers.
The client enters their address.
The client selects to subscribe this address.
The client presses a button to submit this information to the System.
The client receives the response that their address has been subscribed.
Alternative: Invalid address
The client receives the response that their address is invalid.
Alternative: Address already subscribed
The client receives the response that their address has already been subscribed.
Lecture BA17 Sequence Diagrams

6. Lecture BA17 Sequence Diagrams
Standard scenario
Lecture BA17 Sequence Diagrams

7. Lecture BA17 Sequence Diagrams
Alternative scenario
Lecture BA17 Sequence Diagrams

8. Administrator’s use cases
Lecture BA17 Sequence Diagrams

9. Detail of Calculates moving averages
Actor: Administrator
Standard Scenario:
The administrator views the list of moving averages.
The administrator presses a button to calculate the latest moving averages.
The administrator receives the response that the moving averages have been added.
Alternative: Less than 17 share prices
The administrator receives the response that there are insufficient values to calculate the moving averages.
Alternative: Less than 2 moving averages
The administrator receives the response that there are insufficient values to calculate moving average convergence divergence.
Alternative: A crossover has happened
The administrator receives a link to the subscribers.
Lecture BA17 Sequence Diagrams

10. Lecture BA17 Sequence Diagrams
Group task
Draw sequence diagrams (2 in total) for the standard and alternative scenarios of the Calculates moving averages use case
Start with the standard scenario (as should be more straightforward)
Lecture BA17 Sequence Diagrams