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  1. #1
    Join Date
    Sep 2008
    Posts
    1

    Context diagrams and external entities?

    Hi everyone, I hope someone can assist me with data flow diagrams.

    I'm having trouble distinguishing an external entity in my context diagram for a payroll system. Is this the right forum for this type of question?

    Anyways here is the situation, I've got to create a DFD for payroll payroll and sales systems of a courier company. Can an external entity of the payroll be an office worker who updates the spreadsheets of jobs, courier info, jobtracking data stores? or is the office worker part of the system?

    I understand that the obvious external entities would be the bank, government agencies but yeah I'm struggling getting others.

    I've looked at various books, web resources about dfd but am still confused about the whole thing. Any help, email or if someone could point me in the right direction would be great.

    Cheers,

    newbie

  2. #2
    Join Date
    Apr 2002
    Location
    Toronto, Canada
    Posts
    20,002
    the office worker is part of the system

    you're doing fine

    rudy.ca | @rudydotca
    Buy my SitePoint book: Simply SQL

  3. #3
    Join Date
    Sep 2008
    Posts
    33
    Is a data flow diagram anything like a sequence diagram? I must confess that I've never heard about dfds before..

  4. #4
    Join Date
    Apr 2002
    Location
    Toronto, Canada
    Posts
    20,002
    i dunno

    i've never heard of sequence diagrams before
    rudy.ca | @rudydotca
    Buy my SitePoint book: Simply SQL

  5. #5
    Join Date
    Sep 2008
    Posts
    33
    Nevermind, google never fails. Sequence diagrams models application level interactions from start to finnish and are UML artefacts. Looks like dfds are targeted at showing the information flow at the db level. (?)

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