An Abstract from one of the class I am attending currently:
Approximately 60% of the defects are removed in Reviews. Reviews are the basic mechanism for removing defects form the product. A Review must have a guideline as well as checklist.
A review must be followed honestly in order to filter out the possibilities of the defects. A developer must device the Code Review and Design Review Templates for him/her self. The code review template must contain the possible defect areas where a developer is prone to make mistakes. Similarly a design review can be done using traceability metric.