Systems Analysis and Design Chapter 5 Guaranteed A+
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Systems Analysis And Design Chapter 5 Guaranteed
Systems Analysis and Design Chapter 5 Guaranteed A+
Data and Processing Modeling Overview
1. Deliverable of Data and Processing Modeling - The Logical Model: Represents the structured design and organization of data.
2. Three Main Tools of Data and Process Modeling - Data Flow Diagrams (D...
Systems Analysis and Design Chapter 5 Guaranteed A+
Data and Processing Modeling Overview
1. Deliverable of Data and Processing Modeling
- The Logical Model: Represents the structured design and organization of data.
2. Three Main Tools of Data and Process Modeling
- Data Flow Diagrams (DFD): Visual representations of the flow of data within a system.
- Data Dictionary: A repository that defines the data elements used in the modeling process.
- Process Descriptions: Detailed documentation of the operations and logic in a process.
3. Four DFD Symbols
- Process Symbols: Represent processes that transform inputs into outputs.
- Data Flow Symbols: Indicate the flow of data between entities, processes, and data stores.
- Data Store Symbols: Show where data is stored within the system.
- Entity Symbols: Represent external entities that interact with the system.
4. Three Types of Data Flow and Data Processing Combinations to Avoid
- Spontaneous Generation: Outputs from a process without any inputs.
- Black Hole: Inputs to a process without any outputs.
- Gray Hole: Inputs to a process that would not sufficiently produce the outputs.
5. Description of Spontaneous Generation
- Outputs from a process without any inputs: This indicates a lack of input resources leading to
outputs, suggesting incorrect modeling.
6. Description of Black Hole
- Inputs to a process without Outputs: This reflects a scenario where data enters a process but does
not produce any results.
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