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ISTQB Certified Tester Foundation Level (CTFL) v4.0 · ISTQB
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5.2.6 Test Estimation Techniques There are a number of estimation techniques used to determine the effort required for adequate testing. Two of the most commonly used techniques are: The metrics-based technique: estimating the test effort based on metrics of former similar projects, or based on typical values The expert-based technique: estimating the test effort based on the experience of the owners of the testing tasks or by experts