Apart from understanding the code written by others finding the bugs in that code is one major challenge in testing through code inspections. Top-down approach is method for this wherein we start-off with functionality or black-box level and slowly dig into the code, slowly at the module level followed by function level and finally line by line of code. This has added advantage that because of lack of time if we are not able to reach to line level of code even then most of functionality-critical bugs would have already been found.
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