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

Lecture BA17 Sequence Diagrams Session schedule Business Analysis Schedule Academic Year 2014-5 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

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

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

Detail of Subscribes address Actor: Client Standard Scenario: The client views the list of subscribers. The client enters their email address. The client selects to subscribe this email 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

Lecture BA17 Sequence Diagrams Standard scenario Lecture BA17 Sequence Diagrams

Lecture BA17 Sequence Diagrams Alternative scenario Lecture BA17 Sequence Diagrams

Administrator’s use cases Lecture BA17 Sequence Diagrams

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 email the subscribers. Lecture BA17 Sequence Diagrams

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