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Can data come out of a data store and then be processed and then go to an external entity?

the image shows that cold water going to reservoir and then to the heater through U-shaped tubes and then to sprinkler and into container which would process coffee beans and hot water and pour into jug

My question is that is it ok that data (coffee and hot water) are coming out of a data store (container) and then are processed into coffee and then poured into an external entity which is the jig? Is this dfd obeying dfd rules?

Christophe
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Moaaz Siddiqui
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1 Answers1

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  1. DFDs can never contain user as an entity, rather you should represent some functionalities through which the data flows eg. login, authentication etc

  2. Your data here seems correct , you can just optimize the parallel flows using joins and forks

anirudh
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    Ok thanks so much fpr your time this was for exam practice. And i should just replace user with "coffee contents" cause coffee maker wouldn't have any sort of login or authentication, right? – Moaaz Siddiqui Jun 18 '21 at 12:58
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    Yes true , also check `join` `fork` and let me know if you have any more queries – anirudh Jun 18 '21 at 14:50
  • I know this is weird but in system modelling, we show the major subsystem and the relationship between them, right? Can we, like, add dfds in a system model diagram because i googled system modelling and saw alot of dfds? – Moaaz Siddiqui Jul 07 '21 at 18:54