Importance of Bugs in Software Testing Methodology

The importance of bugs on frequency, correction cost, installation cost, and consequences
Frequency: How often does that kind of bug occur? Pay more attention to the more frequent bug types
Correction Cost: What does it cost to correct the bug after it is found? The cost is the sum of 2 factors: The cost of discovery & The cost of correction
These costs go up dramatically later in the development cycle when the bug is discovered. Correction cost also depends on system size
Installation Cost: Installation cost depends on the number of installations: small for single user program, but more for distributed systems. Fixing on bug and distributing the fix could exceed the entire system's development cost
Consequences: What are the consequences of the bug? Bug consequences can range from mild to catastrophic
A reasonable metric for bug importance is: Importance = ($) = Frequency * (Correction cost + Installation Cost + Consequential Cost)

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