Testable Requirements can also be used to measure the thoroughness of test cases as illustrated in Figure 5.
High Level
Requirement (HLR)
|
Testable
Requirements
|
Number
Tested
|
Percentage
Covered
|
Business
|
 |
|
|
Accounting
|
942
|
222
|
24%
|
Administration
|
120
|
24
|
20%
|
Audit and Control
|
225
|
98
|
44%
|
Editing Functions
|
526
|
89
|
17%
|
Update Functions
|
450
|
54
|
12%
|
Maintenance
|
789
|
234
|
30%
|
Conversion
|
2,500
|
1,200
|
48%
|
Security
|
569
|
0
|
0%
|
Reporting
|
3,590
|
2,400
|
67%
|
Subtotal
|
9,711
|
4,321
|
44%
|
|
|
|
|
Technical
|
|
|
|
Communication
|
1,500
|
17
|
15%
|
Interface 1
|
225
|
180
|
80%
|
Interface 2
|
369
|
200
|
54%
|
Subtotal
|
2094
|
397
|
19%
|
|
|
|
|
Total
|
11,805
|
4718
|
40%
|
Coverage Status
Figure 5
In this example, the first column lists the high level requirements. The second column lists the number of testable requirements associated with the corresponding high level requirement. The third column lists the number of testable requirements that are validated by test cases. The fourth column lists the percentage of testable requirements that are "covered" by test cases. This measure of requirements coverage is a very powerful measure and gives important insight into the adequacy of the testing.