System Testing
System testing is the test level that verifies the behavior of the complete integrated system against its specified functional and non-functional requirements.
“A test level that focuses on verifying that a system as a whole meets specified requirements.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is System Testing?
Testing is performed from the user's perspective to confirm that the system satisfies business and technical expectations before acceptance testing.
Complete system focus: The entire application is tested as one unit.
Requirement validation: Functional and non-functional requirements are verified.
Independent evaluation: Usually performed after integration testing.
Real World Example
A regulated product team is preparing a release where System testing appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats System testing as interchangeable with nearby ISTQB terms. That makes test scope blurry and can lead to weak evidence for the release decision.
The tester anchors the discussion in the official definition, asks where the concept appears in the product, and designs examples that show the difference between System testing and similar ideas.
The page becomes useful in practice because System testing is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes System testing in the context of ISTQB terminology?
Question 2
A tester needs to explain System testing to a non‑technical stakeholder. Which approach is MOST appropriate?
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