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L3_SAD - andDesign BIT3444 Fall2008 F ll 2008 G.AlanWang...

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Introduction to System Analysis and Design BIT 3444 F ll 2008 Fall 2008 G. Alan Wang 09 04 2008 09.04.2008 1
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Definitions System organized set of related components established to accomplish certain objective S l i Systems analysis Process of studying a new system or an existing system to determine how it works and how it meets user needs Systems design Process of developing a plan for an improved system based Process of developing a plan for an improved system, based upon the results of the systems analysis 2
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Systems Analysis and Design h d ? Why we do it? To identify and correct problems in the existing system (legacy system) To improve the existing system Outsidegroup may mandate changes Competition can lead to change 3
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SDLC Systems Development Life Cycle Set of activities that developers use to build an information system or software system The order of various activities involved in system development Also referred to as software engineering 4
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SDLC 5
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Preliminary Investigation Feasibility study / System survey Determine the problem Describe theproblem Understand management decisions Organizational chart Informal hierarchy Produces rough plan and what to do 6
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SDLC P li i I ti ti Preliminary Investigation Problem Definition Nature of the problem Separate problem from symptoms of problem Scope of the project Budget and schedule Objectives of the project What user thinks system should do 7
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SDLC l Preliminary Investigation Report What you have found Recommendations Financially feasible Resulting Management Decision Drop Fix a simple problem Authorize the analysis phase 8
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SDLC A l i Analysis d d h Understand the existing system Gather data Analyze data Establish system requirements 9
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SDLC l h Analysis – Data Gathering Written documents Interviews Structured Unstructured
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