Who generates data and who processes it
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Physical data flow diagram shows how the information flow is applied or installed in the system. It is all about implementation of hardwares.
DFD lets you view the flow of information or data through all the system hardwares.
Logical DFD lets you find out how the business operates by showing business activities. Here, you will be able to see a collection of information or data.
Whereas, Physical DFD shows the physical implementations by showing manual procedures, programs, and modules. Here, you will be able to view manual files and databases. Here, you can see how controls are implemented to control the inputs, to obtain the data and to ensure the completion of tasks.
This gives you demonstration of physical activities towards the implementation of the system. This diagram shows how the procedure flows and activities linked to that procedure, such as individuals, files, software, and hardware.
This model is able to let you analyze how physical objects move and the data associated to each unit in the organization.
Below is a simple diagram to give you an idea of DFD
Sourced from: https://warren2lynch.medium.com/data-flow-diagram-comprehensive-guide-with-examples-d9858387f25e
Through level 0 DFD diagram, the whole procedure or system is shown as a single process. Whereas level 1 DFD represents each and every sub-procedure that together form the complete procedure or system.
Balanced DFD means all the input flows to a process and all the output flows from a procedure/process have been saved for the next level.
Level 1 DFD
Level 2 DFD
Yes, DFD is still being used.
DFD is known as a data flow diagram which represents the system in terms of different levels of abstraction. Levels in DFDs are numbered as 0, 1, 2, 3, and so on.
Make sure that information flow is going in and out from the process.
Process should be having an input and an output flow.
Inputs to a process should be adequate to generate output flows.
Procedures should be able to transmit the data.
Data flows should be aligned and in the sequence.
System flow diagram lets you view inputs, outputs, procedures, and divisions that form a system together.
Logical DFD enables you to focus on the business and associated activities. Whereas physical DFD is able to provide you an idea how the whole system has been implemented.
Sourced from: https://www.visual-paradigm.com/guide/data-flow-diagram/logical-vs-physical-data-flow-diagrams/
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