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Level 1 DFD Level 1 DFD At level

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Level 1 DFD Level 1 DFD At level Powered By Docstoc
					                                                    Level 1 DFD
At level 1 you begin to look in more detail at the different processes within an organisation.

If you think about the bicycle shop from the last worksheet. There are number of different
processes:
   a) Making a sale
   b) Processing a repair
   c) Ordering new stock

At this level you start to think about how the data is processed within the organisation. The flow
diagram now includes the different data tables that you put in to ERD in task D


                                                                                             A level 1 DFD contains a
        Customers                                                                            number of processes (The
                                                                                             Square boxes) Where
                                                                                             there is some complexity
                                                                                             in these you may need to
                                                      Bicycle Shop
                                                                                             explain fully what
                  Request                                                                    happens to the data to go
                  Purchase
                                                                                             to a level 2 DFD where
                                           1 Sales                                           these are broken into a
                                                                                             series of smaller data
                                           If new customer        C1 Customers
                                           Add new customer,                                 processes.
                                           Record Sale, Print
                                           Receipt, Take          C2 Sales
                                           money. Update                                     For instance The sales
                                           Stock.                                            process might be broken
                                                                  C3 Stock
                                                                                             down into:
                                                                                             1.1 Check Customer
                                           2 Repairs                                         1.2 Make Sale
        Customers
                                           Look up sales to
                                           check warranty.
                                                                  C4 Servicing               The Repairs system would
                                           Record Servicing
                                           job. When                                         be broken down into
                     Request               complete, inform                                  2.1 Check Sales record
                     Service               customer, record
                                           completion                                        for Warranty
                                                                                             2.2 Record Service Job
                     Advise bike
                     ready                                                                   2.3 Record Completion

                                            3 Stock
                       Order new stock      Check through
                                            Stock file for all    C3 Stock
                                            items low on stock,
       Wholesaler                           send orders. When
                                            received record
                                            deliveries




0086ec82-3d1b-45e3-b0c3-2c8192d3bf5d.doc    Page 1 of 2                          TKH 22 April 2012
1. Below there is a an incomplete Level 1 DFD for the Car Loan system from Task D. Copy this
   diagram into a new Word file and complete this DFD. Hand it in to your teacher for
   checking


           Clients



                                                          Loan System



                                             1
                                                                      C1

                                                                      C2




                                             2 Returns

                                                                      C2 Loans




                                              3 Purchasing
                          Order new stock     Check Loans table for
                                              cars with most use.      C2
                                              Order new cars, to
          Supplier                            replace. On delivery
                                              record new cars
                                                                       C3




0086ec82-3d1b-45e3-b0c3-2c8192d3bf5d.doc    Page 2 of 2                          TKH 22 April 2012

				
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