Task 2: Changing the preconditions and the rules

In this step, you add a test to check that the borrower is at least 18 years old.

if
	'the grade' is not empty

1. Click the Preconditions button.
2. Use the rule editor to add the following statement to the preconditions:

   and the age of 'the borrower' is at least 18 

3. Click OK to save your changes, and close the dialog box.

   The preconditions now contain the following statement:

   if
   	'the grade' is not empty
    	and the age of 'the borrower' is at least 18

   The decision table processes a loan request if the data includes a loan grade, and the borrower is at least 18 years old. The preconditions test the data before each rule in the table is run.

In this step, you update the rows for the new grade to complete the rules. You start by changing one value and copying it to several cells.

1. Click the Grade cell in row 13.
2. Double-click the cell, replace the existing value with D, and then press Enter.
3. Right-click the cell, and click Copy.
4. Select the Grade cells of rows 14 to 16.
5. Right-click the selected cells, and click Paste to change their values from C to D.

In this step, you add values to the condition columns.

1. Double-click the Age cell in row 1.
   The Min cell opens. Type 30 as the minimum value.
2. Click the other subcell (Max).
   Type 65 as the maximum value.
3. Repeat steps 1 and 2 to add 25 and 29, 21 and 24, and 18 and 20 to the Age cells of rows 5, 9, and 13, respectively.
4. Right-click the Age cell in row 1, and click Copy.
5. Select the Age cells of rows 2 to 4.
6. Right-click the selected cells, and click Paste.
7. Repeat steps 4 - 6 with the Age cells in grades B, C®, and D.
8. Steps 8-9 add errors that you fix in the next task. Change the Amount of loan cells for rows 13 and 14 to the following values:
   • Row 13: 100,00A
   • Row 14: Max: 200,000
9. Right-click the Amount of loan cell in row 13, and click Change operator > >. The operator no longer includes values that are less than 100,000.
10. Right-click the Amount of loan cell in row 16, and click Change operator > . The operator includes values less than and equal to 600,000.
11. Press the Optimize Row Order button .
    The action cells for grade D now show an error in red, and triangles that open error messages.

In this step, you enter values in the action columns.

1. Click the Insurance rate cell for row 13, and change the value to 0.006.
2. Repeat step 1 for the rest of the grade D Insurance rate cells:
   • Row 14: 0.006
   • Row 15: 0.008
   • Row 16: 0.008