This is not prioritization in the true sense, but the system is developed in such a way that only useful test cases are designed. So there is no question of prioritization. In this approach, the test planning is done based on the operation profiles of the important functions which are of use to the

customer. An operational profile is a set of tasks performed by the system and their probabilities of occurrence. After estimating the operational profiles, testers decide the total number of test cases, keeping in view the costs and resource constraints.