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picture1_Dfd Examples


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File: Dfd Examples
creating data flow diagrams steps 1 create a list of activities 2 construct context level dfd identifies external entities and processes 3 construct level 0 dfd identifies manageable sub process ...

icon picture PPT Filetype Power Point PPT | Posted on 16 Aug 2022 | 3 years ago
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            Creating Data Flow Diagrams
      Steps:
     1. Create a list of activities
     2. Construct Context Level DFD
        (identifies external entities and processes)
     3. Construct Level 0 DFD 
        (identifies manageable sub process )
     4. Construct Level 1- n DFD 
        (identifies actual data flows and data stores )
     5. Check against rules of DFD
                                  
            DFD Naming Guidelines
       • External Entity   Noun
       • Data Flow   Names of data
       • Process  verb phrase
          – a system name
          – a subsystem name
       • Data Store   Noun
                               
         Creating Data Flow Diagrams
           Lemonade Stand Example
                           
                Creating Data Flow Diagrams
           Example                Steps:
    The operations of a simple     1.  Create a list of activities
    lemonade stand will be used        •    Old way: no Use-Case Diagram
    to demonstrate the creation 
    of dataflow diagrams.              •    New way: use Use-Case Diagram
                                   2.  Construct Context Level DFD
                                       (identifies sources and sink)
                                   3.  Construct Level 0 DFD 
                                       (identifies manageable sub processes )
                                   4.  Construct Level 1- n DFD 
                                       (identifies actual data flows and data stores )
                                              
               Creating Data Flow Diagrams
           Example                1.  Create a list of activities
    Think through the activities 
    that take place at a 
    lemonade stand.
                                       Customer Order
                                       Serve Product
                                       Collect Payment
                                       Produce Product
                                       Store Product
                                             
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...Creating data flow diagrams steps create a list of activities construct context level dfd identifies external entities and processes manageable sub process n actual flows stores check against rules naming guidelines entity noun names verb phrase system name subsystem store lemonade stand example the operations simple will be used old way no use case diagram to demonstrate creation dataflow new sources sink think through that take place at customer order serve product collect payment produce...

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