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To write black box test cases software tester needs the requirement document and design plan. These documents are easily accessible at the very beginning of the project. At the same time white box test cases cannot be written at the initial start of the project. It is so because white box test cases need more architecture clearness which is not accessible at the beginning of the project.
So it is a common situation when white box test cases are written after black box ones. Black box test cases don’t need system comprehension but white box testing requires more structural comprehension. Structural comprehension is more intelligible in the later stages of project. For black box testing QA engineer needs to only analyze from the functional perspective which is easily accessible from a simple requirement document.
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