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dfd for blog website project


DATA FLOW DIAGRAM - Includes Free Template
If you have a massive and complex project with many entities, data, data sources, data destinations and processes going on, a data flow diagram is one of the most effective ways of making sense of all that data. The diagram mostly concerns itself with the flow of data through the system.
The DFD focuses on what the system will accomplish and not the how of it. It does not provide any information on the timing of information flow in the process or the sequence of activities It is popularly used in Structured Systems Analysis and Design.
There can be as many levels to a DFD as possible it depends on the level of granularity you re trying achieve.
Diagram Notations:
  • Gane & Sarson
  • Yourdon & Coad (Shown below)

  1. List all the external entities that provide inputs to the system or receive outputs from the system
  2. Identify and list inputs from and outputs to external entities
*These first 2 steps will give you the context diagram*
  1. Identify all data that passes through the system
  2. Identify the origin and destination of these data
  3. Identify the processing that these data go through (processes)
  4. Identify the means of data storage
  5. Identify data connections from one process to another
  6. Identify data connections from processes to the data store(s)
  1. Don t let it get too complex; 5 - 7 processes is a good guide
  2. Number the processes though the numbering does not necessarily indicate sequence, it s useful in identifying the processes when discussing with users
  3. Re-draw as many times as you need to so that it all comes out neat
  4. All data flows should be appropriately labelled
  5. Data stores should not be connected to an external entity because it would mean that you re giving an external entity direct access to your data files
  6. Data flows should not exist between 2 external entities without going through a process
  7. No two data flows should have the same name
  8. Data flow arrows should point in the direction of the flow
  9. A data store must be connected to a process
  10. There should be a minimum of one data flow in and out of a process
  11. An external entity must be connected to a process
  12. Watch out for black holes a process that has inputs but no outputs
  13. Watch out for miracles a process with no inputs but visible output
  14. Process labels should be verb phrases; data stores are represented by nouns

A project blog is a type of weblog that records a project or a deliverable task, detailing the end goal, procedures and status updates. They promote sharing of tacit knowledge by narratively recording projects' research and development process on the Internet. Project blogs may also detail a hobby project to inspire others.
dfd diagram for blogging website with its all levels (0,1 and 2)

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