REVIEW EFFECTIVENESS

Review Effectiveness is a bit harder to define it. But let me try and explain what I discovered from reading various articles over the internet. 

When you hold a review, say for the SRS, then you would have a total number of defects discovered and you also know the number of pages in the document. So, to first order, you could divide the total number of defects by the number of pages and derive a defect density measure for the document. But that number by itself doesn’t tell you a whole lot. You need to have a good understanding of the expected number of defects per page coming out of a review. That number would come from your historical data. But this number still doesn’t yield an effectiveness measure. You could be finding lots of minor defects in a review and the major ones are slipping through. So you have to look for defects that were missed by the review in downstream activities such as testing and other reviews.

So, basically its really important to know two things- 1. Review Defects and 2. Testing defects. 
Hence, Review Effectiveness will be =

Total Number of Review Defects   X 100
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Total Defects (which includes Review defects + Testing Defects)


For e.g. there are 4 Review Defects and 5 Testing Defects.
Hence Review Effectiveness = 4/(4+5) x 100= 44%