L3 - Systems Analysis Process Techniques

L3 - Systems Analysis Process Techniques - Systems Analysis...

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Unformatted text preview: Systems Analysis Process Techniques Ch. 5 & 6 What is Systems Analysis ? Systems analysis (what) a 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 (how) a complementary problem- solving technique (to systems analysis) that reassembles a systems component pieces back into a complete systemhopefully, an improved system. This may involves adding, deleting, and changing pieces relative to the original system. 2 Model-Driven Analysis Methods Model-driven analysis a problem-solving approach that emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the models becomes the blueprint for designing and constructing an improved system. 3 Model-Driven Approaches Traditional Approaches Structured Analysis (data flow diagram) Focuses on the flow of data through processes Information Engineering (entity relationship diagram) Focuses on structure of stored data Event Model Defines events and the resulting system response Object-Oriented Approach integrates data and process concerns 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 objects data is to use the objects predefined processes. Unified Modeling Language (UML) 4 A Simple Process Model 5 A Simple Data Model 6 Event-Response Model 7 A Simple Object Model 8 Accelerated Systems Analysis Accelerated systems analysis approaches emphasize the construction of prototypes to more rapidly identify business and user requirements for a new system. prototype a small-scale, incomplete, but working sample of a desired system. 9 Discovery Prototyping Discovery prototyping a 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 Ill 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 prematurely Can encourage a premature focus on, and commitment to, design Users can be misled to believe that the completed system can be built rapidly using prototyping tools 10 Rapid Architected Analysis Rapid architected analysis an approach that attempts to derive system models (as described earlier in this section) from existing systems or discovery prototypes....
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L3 - Systems Analysis Process Techniques - Systems Analysis...

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