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 ...
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?
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, ...