Non-functional system testing evaluates various quality attributes of a system rather than specific
behaviors or functionalities. According to the ISTQB CTFL Syllabus, version 4.0, non-functional testing
encompasses several critical aspects:
Performance testing evaluates how the system performs under different conditions, such as load and
stress, to ensure it meets performance requirements.
Usability testing assesses the user-friendliness and overall user experience of the system, ensuring
that it is intuitive and accessible for end-users.
The syllabus outlines that non-functional system testing includes testing the quality attributes of the
system, which goes beyond just functionality and delves into performance, usability, reliability, and
other key attributes.
