Which of the following is a primary objective of testing?

To evaluate work products and prevent defects — One of the primary objectives of testing is to evaluate work products such as requirements, user stories, designs, and code, and to prevent defects. Testing cannot prove the absence of defects. (CTFL v4.0 – Section 1.1.1)

Which principle states that exhaustive testing is impossible?

Exhaustive testing is impossible — The seven testing principles include 'Exhaustive testing is impossible' — testing everything (all combinations of inputs and preconditions) is not feasible except for trivial cases. (CTFL v4.0 – Section 1.2)

The 'pesticide paradox' in software testing means that:

The same tests repeated over time stop finding new defects — The pesticide paradox: if the same set of tests is repeated, they eventually stop finding new defects. Tests must be reviewed and updated regularly. (CTFL v4.0 – Section 1.2)

Which of the following best describes the difference between testing and debugging?

Testing finds failures; debugging identifies causes and fixes defects — Testing shows failures caused by defects. Debugging is the developer activity of finding, analyzing, and removing the cause of a failure. (CTFL v4.0 – Section 1.3)

In the ISTQB test process, which activity comes FIRST?

Test planning — The ISTQB test activities are: test planning, monitoring & control, analysis, design, implementation, execution, and completion. Planning comes first. (CTFL v4.0 – Section 1.4.1)

A traceability matrix is used primarily to:

Link test conditions and test cases back to their basis (e.g. requirements) — Traceability links test conditions, test cases, and test procedures back to the test basis (requirements, user stories, risks) to support coverage analysis and impact analysis. (CTFL v4.0 – Section 1.4.2)

Which of the following is an example of a whole-team approach to quality?

Testers, developers, business analysts and product owners collaborate on quality throughout the project — The whole-team approach (common in Agile) means everyone on the delivery team is responsible for product quality — not just testers. (CTFL v4.0 – Section 1.5)

Which of the following is NOT a typical objective of testing?

Guaranteeing that the software is defect-free — Testing cannot guarantee absence of defects — that violates one of the seven testing principles. (CTFL v4.0 – Section 1.1.1)

Which statement best describes the relationship between error, defect and failure?

A person makes an error, which introduces a defect in the code; when executed the defect may cause a failure — A human error (mistake) introduces a defect (fault, bug) in a work product; when the code containing the defect is executed, it may cause a failure. (CTFL v4.0 – Section 1.1.2)

A defect that is present in the code but never causes a failure is called:

A latent defect — A latent defect is one that exists in the software but has not yet caused a failure — for example because the triggering condition has not occurred. (CTFL v4.0 – Section 1.1.3)

Which principle is illustrated by testing the login screen far more than the About page?

Testing is context dependent — 'Testing is context dependent' — high-risk areas (like login/payment) get more testing than low-risk informational pages. (CTFL v4.0 – Section 1.2)

The principle 'defects cluster together' means that:

A small number of modules usually contain most of the defects — Empirically, a small number of modules or areas contain most of the defects — this supports risk-based prioritisation of tests. (CTFL v4.0 – Section 1.2)

Which of the following best illustrates the 'absence of defects fallacy'?

A team declares the system defect-free after all tests pass, but users still refuse to adopt it because it does not meet their needs — Even a system with zero known defects can fail to satisfy user needs — 'defect-free' is not the same as 'useful and correct'. (CTFL v4.0 – Section 1.2)

Quality assurance (QA) focuses primarily on:

The process used to produce the product — QA is process-focused (are we doing the right things the right way?), while QC and testing are product-focused. (CTFL v4.0 – Section 1.3)

Which activity happens during 'test analysis'?

Identifying test conditions from the test basis — Test analysis derives testable features and test conditions from the test basis (requirements, risks, user stories). (CTFL v4.0 – Section 1.4.1)

During which test activity are test cases arranged into a test procedure specification and combined with automation scripts?

Test implementation — Test implementation prepares everything needed to execute — procedures, data, environment, scripts. (CTFL v4.0 – Section 1.4.1)

'Test completion' activities typically include:

Reporting to stakeholders, archiving testware, capturing lessons learned — Test completion collects test artefacts, produces the test summary report, archives reusable testware and captures lessons learned. (CTFL v4.0 – Section 1.4.1)

Which of the following is a typical work product of the test process?

Test plan, test cases and test summary report — Typical test work products include the test plan, test conditions, test cases, test data, test logs and test summary reports. (CTFL v4.0 – Section 1.4.2)

An 'independent tester' is generally BEST at:

Finding defects that developers overlooked due to author bias — Independence brings a fresh viewpoint, reducing author bias — but at the cost of possibly less domain/product knowledge. (CTFL v4.0 – Section 1.5)

Which soft skill is MOST important for a tester when reporting defects to developers?

Constructive, blame-free communication — Effective testers communicate defects constructively and without blame, focusing on the product not the person. (CTFL v4.0 – Section 1.5)

ISTQB · CTFL v4.0 · Chapter 1

ISTQB Chapter 1 Sample Questions – Fundamentals of Testing (CTFL v4.0 · 2026)

Chapter 1 of the CTFL v4.0 syllabus covers what testing is, why it is needed, the seven testing principles, and the test activities and roles in the test process. Expect definition-heavy questions and scenario-based reasoning around test objectives and the difference between testing and debugging.

Twenty CTFL v4.0-style questions below — tap any question to reveal the correct answer, a plain-English explanation and a syllabus reference. Key terms link through to the ISTQB glossary.

Testing principles Test process Traceability Debugging Whole-team approach