Lesson 3, page 3

14. Next, we will create the datastore that will contain student information. We call the store STUD and we designate its ID as DS1 (We had designated the STUD datastore DS1 in our DFD in Lesson 2).
    • To create the datastore, select the following icon from the toolbar and drop it in the desired organizational unit area.

      
      
      

    • In this case, we would like to place STUD in the Admissions area (the Admissions lane) of the diagram. Enter the name and ID (DS1) of the store as shown in the Create Store Window (See Figure 3.13).

      (If you encounter a uniqueness conflict message, you may use the name DBSTUD and ID as DS3.1. Thereafter, right click on the datastore, go to its properties and change the name and ID to STUD and DS1 respectively). Your process model with the processes and the newly created datastore should look like Figure 3.14.

    
    
    Figure 3.13: The Create Datastore Window
    
    
    Figure 3.14: The Process Diagram with the Datastore named STUD

15. Using step 14, create two more datastores (CRSE with ID as DS2, and ENROL with ID as DS3) in the Registrar's Office. Your updated process model should look like Figure 3.15. Please note that the relative positions of the different processes and datastores in the lane for Registrar's Office maybe different in your case.
    
    
    Figure 3.15: The process model with the two new datastores, CRSE and ENROL

16. Next, we will create a dataflow called student_request from the external called "Student" to the process called "Check Student Status". To do so:
    • Select the following icon from the toolbar.

      
      
      

      Click on the border of the External "Student", and drag it to the border of the Process "Check Student Status" and click again. You will now see the Create Flow Window. Enter the name as student_request and press OK. (See Figure 3.16).

      
      
      Figure 3.16: The Create Flow Window

    • See Figure 3.17 for a view of your process model with the new process flow.
      
      
      Figure 3.17: The Process Diagram with the Data Flow created in Step 16

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