Chapter+12 - Systems Design Chapter 12 System Design...

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Systems Design Chapter 12
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System Design Specification of a detailed computer-based solution. Also called Physical Design . Systems Analysis emphasizes the business problem. Systems Design emphasizes the technical or implementation concerns of the system.
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System Design Approaches Model-Driven Modern structured design Information engineering Prototyping Object-oriented RAD JAD
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Model-Driven Approaches System Design approach that emphasizes drawing system models to document technical and implementation aspects of a System.
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Model-Driven Approaches – Modern Structured Design System Design technique that decomposes the system’s processes into manageable components. Synonyms (although technically inaccurate) are top-down program design and structured programming. Design in a top-down hierarchy of modules. Easier to implement and maintain (change). Modules should be highly cohesive. - Accomplish one function only. Modules should be loosely coupled. - Minimally dependent on one another.
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Structure Chart
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Model-Driven Approaches – Information Engineering (IE) Model-driven and data-centered, but process- sensitive technique for planning, analyzing, and designing information systems. IE models are pictures that illustrate and synchronize the system’s data and processes. The primary tool of IE is a Data Model Diagram.
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Physical Entity Relationship Diagram
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Prototyping Small-scale, incomplete, but working sample of a desired system. Iterative process involving a close working relationship between the Designer and the Users. Key Benefits : Encourages and requires active end-user participation. Iteration accommodates end-users who tend to change their minds. Endorses philosophy that end-users won’t know what they want until they see it. Active model that end-users can interact with.
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Chapter+12 - Systems Design Chapter 12 System Design...

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