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While it is current practice to refer to performance as a non-functional requirement,
performance was considered a functional requirement in the OS/MFT and MVT era. Source:
University of Windsor assembler-course instructor, circa 1980.
In particular, we were required to pre-declare resource requirements needed to achieve
a performance level, which we were expected to state in job time for batch and response
time for a specified load in TP.
If uptime is legitimately a functional requirement, then if only 1/2 the required performance
is available, then the system is as damaged as if it were down 50% of the working day.
I think it's partly to do with the definition of "functional requirement". The modern definition, in the way that defines performance as a "non-functional requirement", seems to use the word "functional" in the sense of "describing the desired functions of the system" (i.e. what it actually does), as opposed to performance as "ensuring that the system delivers those functions" (i.e. whether it actually does it). To my mind, it separates functional yes/no questions of "can the system do x?" (where x is strictly defined as something that either it does or doesn't do) from non-functional questions of "can the system do xiny seconds?" (which is open to changing the goalposts of how big or small yis). — Sasuke Sarutobi (push to talk) 11:48, 3 June 2018 (UTC)[reply]
This article needs to be written from the point of view of someone NOT in the industry. The article should be accessible to anyone who reads at the eighth grade level, and should explain terms without industry jargon. — Preceding unsigned comment added by 204.11.5.125 (talk) 19:41, 15 October 2015 (UTC)[reply]
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