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• Date format: mm/dd/yy, dd/mm/yy, mm/dd/yyy, dd/mm/yyyy
• Number of passengers: 1, 2-4, more than 4
• Special characters included in customer name?: no, yes, no (Note: recall double-weighting)

Tips

“Hendrickson Variables” offer a great checklist to tick through as you think about possible variables to add.

Elisabeth Hendrickson published “Explore It!” in 2013. In our opinion, it is one of the best software testing books ever written. We highly recommend it to new and experienced software testers alike without reservations. Chapter 4, titled “Finding Interesting Things to Vary,” is particularly outstanding. The chapter does a superb job of articulating not only what kinds of variables you can change from test to test but also why it is such a good idea to vary them. These “Hendrickson Variables” come from Chapter 4 of “Explore It!”

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Timing, Frequency, and Duration –

Input and Navigation –

A “rule of thumb” to guide you as you decide what things should be included and excluded in the Parameters screen:

Deciding whether to include a specific test idea often comes down to a judgment call by the test designer using TCD.

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