Chapter 2 – Testing Throughout the SDLC
Scalability Testing – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
Testing to determine the ability of a system to scale up or out under an increasing workload.
In simple words
Check the system can handle growth by adding resources or nodes.
Exam tip
Scale-up = bigger machine; scale-out = more machines.
Related terms
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