Satzinger_Ch04

Satzinger_Ch04 - 4 Chapter 4 Investigating System...

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4 Chapter 4 Investigating System Requirements Systems Analysis and Design in a Changing World, 5th Edition
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4 Learning Objectives Describe the activities of systems analysis Explain the difference between functional and nonfunctional system requirements Describe three types of models and reasons for creating models Identify and understand the different types of users who will be involved in investigating system requirements Describe the kind of information that is required to develop system requirements Determine system requirements through review of documentation, interviews, observation, prototypes, questionnaires, joint application design sessions, and vendor research Discuss the need for validation of system requirements to ensure accuracy and completeness and the use of a structured walkthrough 2
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4 Overview Analysis phase of SDLC skills needed Fact finding for investigation of system requirements Analyst should learn details of business processes and daily operations Analyst should become as knowledgeable as business domain users to build credibility Analyst brings fresh perspective to problem Modeling of business processes based on system requirements 3
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4 The Analysis Phase in More Detail Gather information Define system requirements Functional and nonfunctional Prioritize requirements Prototype for feasibility and discovery Generate and evaluate alternatives Review recommendations with management 4
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4 The Activities of the Analysis Phase T 5 Figure 4-3
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4 Activities of the Analysis Phase and Their Key Questions a 6 Figure 4-2
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4 System Requirements System requirements – specifications that define the new system Functional requirements Activities system must perform (use cases) A Based on procedures and business functions Documented in analysis models Nonfunctional requirements Technical requirement – hardware and software Performance requirement – workload measures Usability requirement – user interface, workflow Reliability requirement – outages, error detection 7
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4 Models and Modeling Analyst describes information system requirements using a collection of models Complex systems require more than one type of model Models represent some aspect of the system being built Process of creating models helps analyst clarify and refine design Models assist communication with system users 8
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4 Reasons for Modeling 9 Figure 4-3
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Satzinger_Ch04 - 4 Chapter 4 Investigating System...

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