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Process_Modeling - An Introduction to System Modeling...

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    An Introduction to System Modeling Logical models Show what a system ‘is’ or ‘does’. They depict the system, independent of any technical implementation. Physical models Show not only what a system ‘is’ or ‘does’, but also how the system is physically and technically implemented. They are implementation-dependent because they reflect technology choices, and the limitations of those technology choices.
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    An Introduction to  Systems Modeling Systems analysis activities tend to focus on the logical system models for the following reasons: o Remove biases due to: o Current system o One person/group view of how the system might be implemented. o Less preoccupied with technical details. o Better communicate with end-users in non-technical or less technical languages.
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    Process Modeling Process modeling A technique for organizing and documenting the structure and flow of data through a system’s PROCESSES. the logic, policies, and procedures to be implemented by a system A systems analysis process model consists of data flow diagrams (DFDs). A data flow diagram (DFD) Synonyms include bubble chart and process model .
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    Process Modeling Data Flow Diagram There are only four symbols and one connection: The rounded rectangles represent processes or work to be done. The squares represent external agents – the boundary of the system. The open-ended boxes represent data stores The arrows represent data flows, or inputs and outputs, to and from the processes.
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    DeMarco/Yourdan and Gane/Sarson DFD Symbols
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    A “Simple” Process for Making Lunch
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    Simple Data Flow Diagram
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    System Concepts for Process Modeling A System is a Process The simplest process model of a system is based on inputs, outputs, and the system itself The process symbol defines the boundary of the system and the environment is outside that boundary.
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