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There are three main elements to determine the estimates for black box testing: productivity, size, test strategy. We can determine the estimate for black box testing for a given project by using all three elements.
Size : For estimating the most important aspect is definitely the size of the project. The size of a project is primarily defined by the number of function points. However function point fails or pays the least attention to the given factors:
Complexity : It defines how many conditions exist in function points identified throughout a project. More conditions mean more test cases which mean more testing estimates.
Interfacing : How much does one function have an effect on the other part of the system? If a function is customized then therefore the other systems have to be tested since one function always impacts another.
Uniformity : How reusable is the application? It is significant to consider how many related structured functions exist in the system. It is important to consider by what extent to which the system allow testing with slight changes.
Test strategy : Every project has certain needs. The significance of all these requirements also affects testing estimates. Any requirement importance is from two perspectives: one is the user usage and the other is the user importance. By these two characteristics a requirement rating can be created and a strategy can be chalked out accordingly, that means estimates differ accordingly.
Productivity : while estimating black box testing this is the main aspect to be considered. Productivity depends on lots of aspects.