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Today, I'm taking a closer look at ISTQB testing principle #4: Defects Cluster Together

In software testing, it is commonly observed that a small number of modules contain most of the defects , especially during pre-release testing. These modules are often responsible for a majority of operational failures.

Defects tend to group together. Defects love parties. When a bug is found in one area, there is an 80% chance another will be found in the same area, and only a 20% chance that the defect will appear elsewhere—unless the next area is another defect cluster.

This information may feed into your risk analysis in order to focus testing efforts and optimise testing spend.

Looking for help on your Nostr project? Feel free to reach out - let’s catch those bugs together! 🚀