# Review Effectiveness

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## Overview

Review Effectiveness is a metric that implies how a review achieves its intended goals or objectives. A high value of this metric implies that more defects are removed in reviews. The cost of fixing a defect during review is much cheaper than the cost of fixing the defect found in testing.

## Review Effectiveness Formula

The formula to calculate the metric is as follows:

Review Effectiveness =

Number of errors found in Reviews
———————————————————- * 100
Number of errors found in { Reviews + Testing }

## Example

Let’s understand with the help of an example. In a software project, the following reviews were conducted:

• Document review – 1 defect reported
• Code Review – 2 defects were reported.

The following tests were conducted.

• Unit testing on the code fix – 1 defect reported
• Regression testing – 3 defects were reported.

Calculate the Review effectiveness based on the given data.

Total number of defects in Reviews = 3
Total number of defects in Testing = 4

Review effectiveness
= (3/7 ) * 100
= 42.85 %

We can also apply this in contexts such as the effectiveness of code review in the development phase of the SDLC:

Number of errors found in Code review
———————————————————————* 100
Number of errors found in { Code review + Unit testing }