Chapter 5- Modeling System Requirements

Chapter 5- Modeling System Requirements - Systems Analysis...

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5 Systems Analysis and Design in a Changing World, Fifth Edition
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5 Learning Objectives Explain why identifying use cases is the key to defining functional requirements Use three techniques for identifying use cases Write brief, intermediate, and fully developed use case descriptions Systems Analysis and Design in a Changing World, 5th Edition 2
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5 Learning Objectives (continued) Explain how the concept of things in the problem domain also defines requirements Identify and analyze data entities and domain classes needed in the system Read, interpret, and create an entity-relationship diagram Read, interpret, and create a domain model class diagram Systems Analysis and Design in a Changing World, 5th Edition 3
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5 Overview Document functional requirements by creating models Models created during analysis phase activity – Define system requirements Two concepts help identify functional requirements in the traditional approach and object-oriented approach Use cases and the events that trigger them Things in the users’ work domain Systems Analysis and Design in a Changing World, 5th Edition 4
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5 User Goals, Events, and Use Cases Use Case -- An activity the system performs in response to a user request Techniques for identifying use cases User goal technique Each goal at the elementary business process (EBP) level is a use case EBP – a task performed by one user, in one place in response to a business event, that adds measurable business value, and leaves system and data in consistent state Systems Analysis and Design in a Changing World, 5th Edition 5
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5 User Goals, Events, and Use Cases (continued) CRUD analysis technique (create, read, update, delete) Event decomposition technique Systems Analysis and Design in a Changing World, 5th Edition 6
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5 Identifying Use Cases Based on User Goals Systems Analysis and Design in a Changing World, 5th Edition 7 Figure 5-1
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5 Use Case Based on CRUD Technique Systems Analysis and Design in a Changing World, 5th Edition 8 Figure 5-2
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5 Event Decomposition Technique Event – an occurrence at a specific time and place and which needs to be remembered Business events trigger elementary business processes (EBPs) EBPs are at correct level of analysis for use cases Identify business events to decompose system into activities/use cases Systems Analysis and Design in a Changing World, 5th Edition 9
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5 Types of Events External Outside system Initiated by external agent or actor Temporal Occur as result of reaching a point in time Based on system deadlines State Something inside system triggers processing need Systems Analysis and Design in a Changing World, 5th Edition 10
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5 Events Affecting a Charge Account Processing System that Lead to Use Cases Systems Analysis and Design in a Changing World, 5th Edition 11 Figure 5-3
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5 External Event Checklist Systems Analysis and Design in a Changing World, 5th Edition 12 Figure 5-4
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5 Temporal Event Checklist Systems Analysis and Design in a Changing World, 5th Edition 13 Figure 5-5
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