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You are preparing the estimate for the test plan, which should cover all test activities subsequent to the plan having been agreed. Estimation of test activities has in the past been embarrassingly inaccurate. Historical data from previous similar projects is unreliable, but for two recent projects it is possible to find out how many test cases were developed and how long this took. Which TWO of the following estimation techniques will be BEST in this scenario?
Correct Answer: B,C
* B (Test case quantity / effort per test case):Since you know the number of test cases developed and time taken in recent projects, you can directly calculate an average effort per test case - this is a form of metrics-based estimation. * C (3-point estimation):This is useful when precise historical data is limited or unreliable. It uses best- case, worst-case, and most-likely estimates to improve accuracy. "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..." - ISTQB-CTFL_Syllabus_2018_V3.1, section 5.2.6