CTFL v4.0 · ISTQB · Fundamentals of Testing · Bank updated 2026-07-03
CTFL v4.0 practice questions: Fundamentals of Testing
5 free questions from 29 on this area · answer and explanation for each · no sign-up
These 5 questions come from the Fundamentals of Testing section of our CTFL v4.0 bank (29 questions on this area, which carries 20% of the real exam). Every question is original, with the correct answer explained and linked to the source it is drawn from.
1/5 · Fundamentals of Testing · easy
A developer misinterprets a business rule while coding a discount calculation. This mistake is shipped to production and later causes the system to display an incorrect discount to a customer. Using ISTQB terminology, which sequence correctly labels these events in order?
AFailure (misinterpretation) → Defect (incorrect code) → Error (wrong discount displayed)
BError (misinterpretation) → Defect (incorrect code) → Failure (wrong discount displayed)
CDefect (misinterpretation) → Error (incorrect code) → Root cause (wrong discount displayed)
DRoot cause (misinterpretation) → Failure (incorrect code) → Defect (wrong discount displayed)
Show answer & explanation
B is correct. ISTQB defines the chain as: a human error (mistake) introduces a defect (fault) into a work product, which, when executed, may cause a failure (deviation from expected behavior). The misinterpretation is the root cause of the error.
↗ ISTQB CTFL Syllabus v4.0.1 — Fundamentals of Testing
2/5 · Fundamentals of Testing
A team decides to involve testers in requirements reviews and to write acceptance criteria before any code is developed, aiming to catch defects as early as possible in the SDLC. Which ISTQB CTFL v4.0 concept does this practice best illustrate?
AA shift-left approach, informed by the principle that early testing saves time and money by finding defects when they are cheaper to fix
BIndependence of testing, since testers work with requirements before developers touch the code
CConfirmation testing, since reviewing requirements confirms that previously fixed defects stay fixed
DMitigation of the pesticide paradox, since new reviewers keep the test suite fresh
Show answer & explanation
A is correct. Shift-left refers to performing testing activities, such as reviews and static testing, as early as possible in the SDLC, directly applying the principle that early testing saves time and money by catching defects when they are cheapest to fix.
↗ ISTQB CTFL Syllabus v4.0.1 — Fundamentals of Testing
3/5 · Fundamentals of Testing · hard
A tester is evaluated on: (1) knowledge of test techniques and how to apply them, (2) understanding of the business domain and its terminology, (3) knowledge of how the software is developed, such as the SDLC model in use, and (4) communication and critical-thinking soft skills. According to the ISTQB CTFL v4.0 Syllabus, this set of competencies reflects:
AThe combination of essential skills a tester needs, which together enable effective testing beyond technical test-technique knowledge alone
BRequirements for the test manager role only; individual testers only need test-technique knowledge
CA description of the seven testing principles applied to skills management
DThe certification syllabus's chapter structure (chapters 1–4), rather than a description of tester skills
Show answer & explanation
A is correct. ISTQB CTFL v4.0 describes essential skills for testers as a blend of testing knowledge, domain/business knowledge, knowledge of software development, and soft skills (e.g., communication, critical thinking, attention to detail), all of which combine to make testing effective.
↗ ISTQB CTFL Syllabus v4.0.1 — Fundamentals of Testing
4/5 · Fundamentals of Testing · hard
A Scrum team practices the whole-team approach: developers, the Product Owner, and one specialist tester collaboratively write and refine acceptance criteria, and the specialist tester is embedded full-time in the team, also performing exploratory testing on stories developers implement. A stakeholder argues this setup provides no real independence and should be replaced by an external test team. Which response is best aligned with the syllabus's guidance on independence of testing?
AThe embedded specialist tester still provides a degree of independence from the authors of the code under test, since they did not write that code, while remaining closely collaborative; full external independence is only one of several valid levels and is not required in every context.
BTrue independence can only be achieved by outsourcing all testing to a team external to the organization, so the embedded tester currently provides no independence benefit whatsoever.
CBecause the tester helps write acceptance tests jointly with the team, this collaborative activity should be classified as debugging rather than testing.
DThe stakeholder is right: embedding a specialist tester inside the team contradicts the whole-team approach, so the role should be removed and all testing left entirely to the code's own authors.
Show answer & explanation
A is correct. The syllabus recognizes several levels of independence of testing and explains that the whole-team approach does not eliminate the value of testing-specific skills or of some independence from a work product's author; an embedded tester within an Agile team is a recognized, valid level that balances collaboration with an independent perspective, without requiring full external outsourcing.
↗ ISTQB CTFL Syllabus v4.0.1 — Fundamentals of Testing
5/5 · Fundamentals of Testing
A project stakeholder tells the test manager: 'Now that we have a dedicated testing team, we don't need any separate quality assurance activities—testing already IS quality assurance.' Which response, grounded in the CTFL syllabus's treatment of testing and quality assurance, most accurately corrects this statement?
AThe stakeholder is correct; testing and quality assurance are simply two names for the same set of activities, performed by the same role.
BQuality assurance is focused on the processes used to develop and test the software, aimed at preventing defects, while testing is one of several activities that contribute to achieving adequate quality; it does not by itself constitute all QA activities.
CQuality assurance becomes unnecessary as soon as automated tests achieve 100% code coverage of the software.
DTesting focuses entirely on improving development processes, while quality assurance focuses entirely on finding defects in the delivered product.
Show answer & explanation
B is correct. The CTFL syllabus distinguishes quality assurance, which is concerned with the processes used to develop and test the software with the aim of preventing defects, from testing, which is one of several activities—alongside reviews and other techniques—that contribute to achieving adequate quality within that process. Equating testing with the whole of quality assurance, or assuming full code coverage removes the need for QA, are misconceptions the syllabus implicitly guards against by keeping these concepts distinct.
↗ the ISTQB Certified Tester Foundation Level (CTFL) Syllabus v4.0 — Fundamentals of Testing
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