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3) Pairwise method - based on the observation that most faults are caused by interactions of at most two factors, Pairwise-generated test suites cover all combinations of two therefore are much smaller than exhaustive ones yet still very effective in finding defects. See http://www.pairwise.org/
A step by step process is available:
Why would I use it?
Smarter test practices mean time is gained and quality is increased, data generation methods can result in up to 85% time savings when creating test suites. Benefits are:
- Creating combinatorial data for data load tests.
- Quickly creating hundreds of Test Cases where repetition is required.
- Data driven test planning.
- Creating test cases for an already implemented module without any documented specification.
- During review or walk through of specifications or code.