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Defect Leakage

Defect leakage occurs on the Customer or End User side after the delivery of the application.

Once the application has been released to the client, if the end user gets any kind of defect using the application, it is called "Defect leakage".

Formula for Defect Leakage:

Defect Leakage = Number of Defect found during next phase / ( Number of Defects found during testing + Number of Defects found during next phase) * 100

For Example, During the UAT production site, 50 defects were detected by the end users and 150 defects were detected throughout the QA process, including both the test site and the production site. Therefore, the defect leakage would be:

Defect Leakage = (50/150)*100

Defect Leakage =33 %

Reasons for Defect Leakage:

  • Absence of stringent test cases walkthrough and review process.
  • Environment differences.
  • Missing test cases to cover appropriate condition.
  • Poorly designed test case due to misunderstood requirements.
  • Incorrect deployment in UAT or production.
  • Use of incorrect test data.

The ways to avoid high-leakage defects are:
  • Test the product like an environment in the real world.
  • Verify sensitive content and fields
  • Choose a specific area, and perform a detailed analysis and test.
  • Find components which are susceptible to high leakage of defects.
  • Perform rigorous testing on tiniest components.
  • Consider a rewrite if things are truly bad.
  • Take a closer look at the whole system.

For example for the project running in Sprint we can find the defect leakage as below:

Defect Leakage = (Post sprint defect count */ Defect detected during sprint) *100



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