DFD
DFD is a graphical technique that describes the flow of information and transformation that is applied when data moves from input to output. Another name DFD is a data flow graph or chart buble.
DFD objectives are:
1. Gives an indication of how the data are transformed during the data move through the system
2. Describes the functions (and sub functions) that transform the data stream
following tips in making DFD:
1. Choose notation so that the process is decomposed or not decomposed can be read easily
2. Bubble name must consist of a verb and a noun
3. The name used for the Bubble, data store, dataflow should be consistent (ID necessary)
4. Each level must be consistent with the data flow of the previous level of
5. Try to keep the external entity at any level of consistent placement
6. The number of bubble is recommended at any level does not exceed 7 bubble
7. Decomposition based on data groups are preferred (ease the flow of data into the same storage)
8. The common name only for the bubble that will still be decomposed
9. In the process that has not decomposed, process name and the name must have specific data
10. Flow into the storage to go through the process, not directly from the external entity
11. Data flow for Process Report .. : There must flow out. There will be inflow if necessary parameters to enable the report
12. Data stream that does not exist datastorenya be investigated, if it does not reflect the persistent entity (needs to be stored in the file / table), which later will only be a variable in the program.
by batam
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