This white paper from Tricentis introduces the concept of "extra-functional testing," a term that seeks to update the traditional notion of non-functional testing by emphasizing its crucial role in meeting modern software performance requirements. It argues that attributes like performance, security, usability, compatibility, and reliability, traditionally considered non-functional, are essential and should be viewed as additional layers necessary to exceed customer expectations. The paper reflects on the evolution of testing practices, highlighting the industry's shift towards prioritizing these extra-functional aspects over basic functionality to better align with what users require from their applications today.

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