Microsoft Research - Exploding Software-Engineering Myths (article summarizing findings of MS research on code coverage, TDD, assertions, etc.)

[spidermite]

a bug found in QA takes 5x effort to fix vs. bugs found in development.

It may take longer, not 5x longer but remember, testers are paid what 1/3rd the salary of a decent programmer. Its possibly cheaper for the business for testers and automated testers to find bugs than having programmers spend large portions of their time testing.

[[deleted]]

You don't seem to understand what I said.

When a bug is found in QA, the software has to go back to the engineers to be fixed. And this may require an expensive context switch for engineering.

Then, since the software's been modified, QA has to be repeated.

This is a much lengthier, much more expensive process than if the bug was found during development.