What is a Combo Countdown, and why didn mine go to zero?
The Combo Countdown is a sequence of numbers displayed in the results with the test cases. The numbers indicate how many test value pairs remain to be covered after each test case is run. If all the pairs are covered, the Combo Countdown will end at zero. If your request has a partition with multiple blocks (to avoid disallowed combinations), then the Combo Countdown ends with the number of those disallowed pairs. The Combo Countdown is a useful metric to show how many pairs are to be covered in a test job, and how the coverage rate slows as the job progresses. What is an orthogonal array? An orthogonal array has the property that pairs of elements in the same row and from different columns occur an equal number of times in the array. Orthogonal arrays have been used for several years as templates in experimental design, including system testing. For information on engineering using orthogonal arrays, see Chapter 3 of Quality Engineering Using Robust Design, M. S. Phadke, 1989, Prentic
