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Exam+2+Review - Exam 2 Review What is Systems Analysis ?...

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Exam 2 Review
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What is Systems Analysis ? Problem-solving technique that decomposes a system into its component pieces for the purpose of studying how well those component parts work and interact to accomplish their purpose. Systems Design – Complementary problem-solving technique (to systems analysis) that reassembles a system’s component pieces back into a complete system. This may involves adding, deleting, and changing pieces relative to the original system. Information Systems Analysis – The development phases in an Information Systems Development Project that primarily focus on the business problem and requirements, independent of any technology that can or will be used to implement a solution to that problem.
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Model-Driven Analysis Methods Model-Driven Analysis – Problem-solving approach that emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system model becomes the blueprint for designing and constructing an improved system. Model – Representation of either reality or vision. Since “a picture is worth a thousand
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Model-Driven Approaches Traditional Approaches Structured Analysis Focuses on the flow of data through processes Key model: Data Flow Diagram (DFD) Information Engineering Focuses on structure of stored data Key model: Entity Relationship Diagram (ERD) Object-Oriented Approach Integrates data and processes into objects Object – the encapsulation of the data (called properties) that describes a discrete person, object, place, event, or thing, with all the processes (called methods) that are allowed to use or update the data and properties. The only way to access or update the object’s data is to use the object’s predefined processes. Unified Modeling Language (UML)
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Simple Process Model
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Simple Data Model
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Simple Object Model
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Accelerated Systems Analysis Emphasizes the construction of prototypes to more rapidly identify business and user requirements for a new system. Prototype – Small-scale, incomplete, but working sample of a desired system. Accelerated Systems Analysis approaches Discovery Prototyping Rapid Architected Analysis
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Discovery Prototyping Technique used to identify the users’ business requirements by having them react to a quick-and-dirty implementation of those requirements. Advantages Prototypes cater to the “I’ll know what I want when I see it” way of thinking that is characteristic of many users and managers. Disadvantages Can become preoccupied with final “look and feel” too early. Can encourage a premature focus and commitment to design. Users can be misled to believe that the completed system can be built rapidly using prototyping tools.
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Rapid Architected Analysis An approach that attempts to derive system models from existing systems or discovery prototypes. Reverse Engineering
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Exam+2+Review - Exam 2 Review What is Systems Analysis ?...

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