Management Information Systems DFD Simple Case for Student
- 1. Creating Data Flow Diagrams Lemonade Stand Example
- 2. Creating Data Flow Diagrams 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
- 3. Creating Data Flow Diagrams Also think of the additional activities needed to support the basic activities. Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor 1. Create a list of activities
- 4. Creating Data Flow Diagrams Group these activities in some logical fashion, possibly functional areas. Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor 1. Create a list of activities
- 5. Creating Data Flow Diagrams Context Level DFD Create a context level diagram identifying the sources and sinks (users). Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor VENDOR 2. Construct Context Level DFD (identifies sources and sink)
- 6. Creating Data Flow Diagrams Level 0 DFD Create a level 0 diagram identifying the logical subsystems that may exist. Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor 3. Construct Level 0 DFD (identifies manageable sub processes ) 2.0 Production EMPLOYEE 1.0 Sale 3.0 Procure-m ent CUSTOMER VENDOR 4.0 Payroll
- 7. Creating Data Flow Diagrams Level 1 DFD Create a level 1 decomposing the processes in level 0 and identifying data stores. 4. Construct Level 1- n DFD (identifies actual data flows and data stores ) Sales Forecast Payment Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor Customer Order ORDER PAYMENT Severed Order Request for Forecast CUSTOMER
- 8. Creating Data Flow Diagrams Level 1 DFD Create a level 1 decomposing the processes in level 0 and identifying data stores. 4. Construct Level 1 (continued) Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor Product Order ORDER INVENTORTY Quantity Severed Production Schedule RAW MATERIALS Quantity Produced & Location Stored Quantity Used Production Data
- 9. Creating Data Flow Diagrams Level 1 DFD Create a level 1 decomposing the processes in level 0 and identifying data stores. 4. Construct Level 1 (continued) Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor Order Decision PURCHASE ORDER Received Goods RAW MATERIALS Quantity Received Quantity On-Hand RECEIVED ITEMS VENDOR Payment Approval Payment
- 10. Creating Data Flow Diagrams Level 1 DFD Create a level 1 decomposing the processes in level 0 and identifying data stores. 4. Construct Level 1 (continued) Time Worked Customer Order Serve Product Collect Payment Produce Product Store Product Order Raw Materials Pay for Raw Materials Pay for Labor TIME CARDS Payroll Request EMPLOYEE Employee ID PAYROLL PAYMENTS Payment Approval Payment Unpaid time cards
- 11. Process Decomposition 0.0 Lemonade System Level 0 Level 1 Context Level
- 12. CSUB Burger’s Order Processing System • Draw the CSUB Burger’s context diagram – System • Order processing system – External entities • Kitchen • Restaurant • Customer – Processes • Customer order • Receipt • Food order • Management report