4.5 Experience-based techniques (K2)



Experienced-based testing is where tests are derived from the tester’s skill and intuition and their experience with similar applications and technologies. When used to augment systematic techniques, these techniques can be useful in identifying special tests not easily captured by formal techniques, especially when applied after more formal approaches. However, this technique may yield widely varying degrees of effectiveness, depending on the testers’ experience. A commonly used experienced-based technique is error guessing. Generally testers anticipate defects based on experience. A structured approach to the error guessing technique is to enumerate a list of possible errors and to design tests that attack these errors. This systematic
approach is called fault attack. These defect and failure lists can be built based on experience, available defect and failure data, and from common knowledge about why software fails.

Exploratory testing is concurrent test design, test execution, test logging and learning, based on a test charter containing test objectives, and carried out within time-boxes. It is an approach that is most useful where there are few or inadequate specifications and severe time pressure, or in order to augment or complement other, more formal testing. It can serve as a check on the test process, to help ensure that the most serious defects are found.

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