Also sometimes known as para-functional, this tag covers both the quality attributes beyond the functional, and the test techniques intended to reveal information about them. For example, performance, reliability, usability.

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Why is separating functional and non-functional test important (or not)?

There have been several questions lately along the lines of "Is X a functional or non-functional type of testing?". Although I understand the distinction, it's never been an important distinction for ...
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Installation testing is part of functional or non-functional testing?

In your test strategy/testing where would the installation testing (set-up/deployment with or without installer) belong? Is it a part of functional testing or non-functional testing?
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What are the similarities and differences between UX as a software quality and other quality requirements?

There are a number of quality requirements (also known as non-functional requirements) that have been explored over the years both in theory and practice. Examples are: performance, security, ...