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Data Flow Diagrams (Logical) PowerPoint Presentation
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Data Flow Diagrams (Logical)

Data Flow Diagrams (Logical)

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Data Flow Diagrams (Logical)

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  1. Data Flow Diagrams(Logical)

  2. Inventory ActivitiesLogical Activities • Maintain inventory data • Add to number in inventory when order is received • Take a physical inventory (or subtract from number in inventory when items are used or shipped) • When number in inventory is less than the reorder point, order the designated quantity from the supplier • When bill from supplier is received, pay bill

  3. Logical DFDActivities 1 and 2: Update Inventory (added and used) Stock on Hand Products 1.0 Update Inventory Added Supplier Counts Qty Added 2.0 Update Inventory Used D1 Inventory Amounts Used

  4. Logical DFDActivities 3 and 4: Order and Pay for Inventory Supplier payment Invoices Orders Inventory D1 4.0 Generate Payments 3.0 Generate Orders Qty on hand Reorder qty Reorder point

  5. Logical DFD Stock on Hand Invoices 1.0 Update Inventory Added Supplier Counts Invoices Amt Due Orders payment Qty Added 2.0 Update Inventory Used D1 Inventory Amounts Used 4.0 Generate Payments 3.0 Generate Orders Qty on hand Reorder qty Reorder point

  6. Data Flow Diagrams(Logical - Revised by Dr. Ketler)

  7. Inventory ActivitiesLogical Activities • Maintain inventory data • Add to number in inventory when supplier order is received • Take a physical inventory (or subtract from number in inventory when items are used or shipped) • When number in inventory is less than the reorder point, order the designated quantity from the supplier • When bill from supplier is received, • Check inventory data to verify that order has been received (not in the textbook example; added by Dr. Ketler) • Pay the bill

  8. Logical DFD - Ketler’s Version -- Level -0 1.0 Maintain Inventory Supplier Counts Stock on Hand Products payment Qty Added/Used Inventory D1 2.0 Generate Orders Orders Qty on hand Reorder qty Reorder point 3.0 Payment Processing Invoice Amount Due Inventory data

  9. Logical DFD - Ketler’s Version Decomposition of Process 1.0 1.1 Update Inventory Added Supplier Inventory D1 Products Qty Added 1.2 Update Inventory Used Amounts Used Stock on Hand Counts