Consider the test cycle ith for which the testing team needs to estimate the effort required to perform the testing activities. At the end of the test cycle i-1 or at the beginning of i, the team determines a set of test cases to be tested in i. The team then
estimates the size and effort using this set of test cases as the main input together with parameters calibrated from the previous cycles. At the end of the cycle ith, actual data about size, effort,