What was the most important change in the way we do QA?
Traditionally, quality assurance would rely on thorough testing. By performing experiments with the product we would learn about product defects, which would then be prioritized and fixed. Thus, the probability that the user will experience an error will be decreased.
It does make perfect sense in an environment where the cost of failure is intolerable and recovery is not easy.
In contrast, many modern products rely on how easy and cheap it is to recover when users experience a defect. With current DevOps practices and telecommunication technologies, it is often a better choice.
Finally, both approaches are not excluding each other and can be used together.
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