“Peer reviews catch 60% of the defects.” http://www.cs.umd.edu/~mvz/pub/eworkshop02.pdf All of us have known for a long time that code reviews find defects, and that reviews are cheaper and can be more effective than most kinds of testing. In Code Complete, Steve McConnell builds an overwhelming case for code reviews: disciplined code inspections can find between 45%-70% of all defects in code, while even fast, informal reviews can find 20%-30%. Studies at IBM, HP, Microsoft and other places show that it is several times cheaper to find bugs in code reviews than through testing. And evidence keeps coming in to support that code reviews work. http://www.cc2e.com/
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