Feasibility study and data flow diagram
- 3. Graphical representation of the "flow" of data A DFD shows the flow of data through a system Data flow diagrams were proposed by Larry Constantine. Visualization of data processing (structured design). It is therefore quite different from a flowchart.
- 4. Data flow diagram Data Flow Diagram (DFD) is graphical representation of flow of data/info. It is used to show how data is moved between different processes. Which graphically represent the relation between processes and data. Data Flow Analysis The stress is mainly on data analysis. After the flow of data through business processes is data flow analysis. While handling transactions and finish by tasks, data are input, processed, stored retrieved used, change and output. Data flow analysis studies the use of data in each event.
- 6. Physical Data flow diagram • Physical characteristics include - Names of people - Forms and document Name - Names of department - Master and transaction files - Equipments and devices used - Locations • Most comprehensive and useful approach to developing an accurate and complete description of current system begins with the development of a physical DFD
- 7. Data flow diagram Data Flow Diagram (DFD) is graphical representation of flow of data/info. It is used to show how data is moved between different processes. Which graphically represent the relation between processes and data. Data Flow Analysis The stress is mainly on data analysis. After the flow of data through business processes is data flow analysis. While handling transactions and finish by tasks, data are input, processed, stored retrieved used, change and output. Data flow analysis studies the use of data in each event.
- 8. • Four simple notations are sufficient to finish a DFD. They are:- Data flow Data store Process External entities
- 9. Data flow diagram External Entity Process Process Process Process External Entity Process
- 10. Simple graphic technique Helps in defining the boundaries Communicating current system As a part of system documentation file Explains the logic behind the DF within the system
- 11. Physical consideration are left out Confusion about the system Different DFDs model have different symbols Process is slow