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Exam Code: CTFL v4.0

Exam Name Certified Tester Foundation Level (CTFL) v4.0

Certification Provider: ISTQB

Corresponding Certification: CTFL

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ISTQB CTFL v4.0 Practice Test 9

Question 80

During a release-readiness review, a tester observes: A large website reports only escaped defects in customer support but never analyzes why the same category returns across releases. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Feed defect trends and root causes into retrospectives and prevention actions.
  2. Review high-impact business rules using independent examples and representative data.
  3. Define user-relevant quality criteria before selecting tests.
  4. Schedule requirement reviews and examples before implementation begins.

Explanation

Correct Answer

A:

This safeguard specifically targets the contributing cause: Feed defect trends and root causes into retrospectives and prevention actions. It addresses the principle (Defect and failure analysis can support preventive quality improvements beyond correcting each symptom.) and can be assessed by: Later releases show fewer repeated causes with evidence of process changes and relevant checks.

Incorrect Answers

B:

This preventive step mitigates a different project risk (syllabus section 1.2): A subscription startup skips testing after its lead developer says careful coding alone guarantees correct billing for every tax region. The targeted safeguard for the current case is: Feed defect trends and root causes into retrospectives and prevention actions.

C:

This preventive step mitigates a different project risk (syllabus section 1.2): A weather-app team measures software quality solely by the total defects found, overlooking a slow startup that users abandon. The targeted safeguard for the current case is: Feed defect trends and root causes into retrospectives and prevention actions.

D:

This preventive step mitigates a different project risk (syllabus section 1.1): A retailer reviews product requirements only after code is deployed and discovers an ambiguous return window that all developers implemented differently. The targeted safeguard for the current case is: Feed defect trends and root causes into retrospectives and prevention actions.

Question 81

A test analyst investigates the following quality concern: A travel-site team executes every conceivable destination, browser, payment, and language combination in its test plan despite an impossible schedule. Which testing activity or corrective action best addresses this situation?

  1. Use defect clustering as one input while also assessing new integration and business risks.
  2. Re-evaluate test coverage when requirements and operating conditions evolve.
  3. Separate identification and reporting of a defect from the developer's correction and subsequent retest.
  4. Prioritize representative combinations and high-risk cases rather than promising exhaustive input coverage.

Explanation

Correct Answer

D:

The targeted action is: Prioritize representative combinations and high-risk cases rather than promising exhaustive input coverage. It addresses the underlying software-testing principle: Exhaustive testing is generally impractical outside small, tightly bounded input domains. The relevant confirming evidence is: The test plan documents selected coverage and risk-based omissions within the available time.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 1.3, Testing Principles): A mobile game team decides to test only its newest animations after finding many prior defects there, overlooking a newly connected payment component. The present problem instead depends on: Exhaustive testing is generally impractical outside small, tightly bounded input domains.

B:

This choice is a useful response to a different testing situation (section 1.3, Testing Principles): A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. The present problem instead depends on: Exhaustive testing is generally impractical outside small, tightly bounded input domains.

C:

This choice is a useful response to a different testing situation (section 1.1, What is Testing?): A mobile banking tester documents a wrong transfer confirmation message but the project manager counts the ticket itself as a completed correction. The present problem instead depends on: Exhaustive testing is generally impractical outside small, tightly bounded input domains.

Question 82

A test analyst investigates the following quality concern: A travel-site team executes every conceivable destination, browser, payment, and language combination in its test plan despite an impossible schedule. Which observation best verifies that the stated testing issue is addressed?

  1. Refreshed tests expose a session-expiry defect missed by the aging dataset.
  2. The permissions flaw is found in a model review before its implementation is complete.
  3. The test plan documents selected coverage and risk-based omissions within the available time.
  4. A feasible schedule allocates effort to critical flows with explicit trade-offs and coverage evidence.

Explanation

Correct Answer

C:

This is the expected verification outcome: The test plan documents selected coverage and risk-based omissions within the available time. It directly checks the corrective activity (Prioritize representative combinations and high-risk cases rather than promising exhaustive input coverage.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: An online examination team runs the identical dataset every sprint and sees fewer new findings, treating this as proof the application has become defect free. It does not establish the required result for this case: The test plan documents selected coverage and risk-based omissions within the available time.

B:

This result may validate another testing scenario: A bank queues all security testing for the final release weekend, and a permissions architecture defect forces a redesign. It does not establish the required result for this case: The test plan documents selected coverage and risk-based omissions within the available time.

D:

This result may validate another testing scenario: A company plans regression testing solely by the number of developers available and ignores the release deadline and business risk. It does not establish the required result for this case: The test plan documents selected coverage and risk-based omissions within the available time.

Question 83

A test analyst investigates the following quality concern: A travel-site team executes every conceivable destination, browser, payment, and language combination in its test plan despite an impossible schedule. Which testing concept or underlying cause best explains the reported problem?

  1. Testing is context-dependent and prior passing evidence is not a permanent guarantee.
  2. Absence of observed software defects does not guarantee useful or successful software.
  3. Exhaustive testing is generally impractical outside small, tightly bounded input domains.
  4. Test activities are iterative and must be adapted as product understanding and scope change.

Explanation

Correct Answer

C:

The most relevant explanation is: Exhaustive testing is generally impractical outside small, tightly bounded input domains. This describes why the original situation (A travel-site team executes every conceivable destination, browser, payment, and language combination in its test plan despite an impossible schedule.) merits the response: Prioritize representative combinations and high-risk cases rather than promising exhaustive input coverage.

Incorrect Answers

A:

This principle could explain a different testing issue: A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. The present case is better explained by: Exhaustive testing is generally impractical outside small, tightly bounded input domains.

B:

This principle could explain a different testing issue: A hospital deployment passes every specified feature test, but clinical staff discover workflows that are unsafe and cannot satisfy patient handoff needs. The present case is better explained by: Exhaustive testing is generally impractical outside small, tightly bounded input domains.

D:

This principle could explain a different testing issue: A tester receives a new feature after a sprint begins but continues executing only tests from the previous backlog without updating the intended scope. The present case is better explained by: Exhaustive testing is generally impractical outside small, tightly bounded input domains.

Question 84

A test analyst investigates the following quality concern: A travel-site team executes every conceivable destination, browser, payment, and language combination in its test plan despite an impossible schedule. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Periodically revise test data and methods instead of relying only on repeated historical scripts.
  2. Reassess the test strategy when product use and risk classes differ.
  3. Monitor skipped assertions and test-procedure completeness in reports.
  4. Use risk assessment and systematic selection instead of unbounded all-combinations claims.

Explanation

Correct Answer

D:

This safeguard specifically targets the contributing cause: Use risk assessment and systematic selection instead of unbounded all-combinations claims. It addresses the principle (Exhaustive testing is generally impractical outside small, tightly bounded input domains.) and can be assessed by: The test plan documents selected coverage and risk-based omissions within the available time.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 1.3): An online examination team runs the identical dataset every sprint and sees fewer new findings, treating this as proof the application has become defect free. The targeted safeguard for the current case is: Use risk assessment and systematic selection instead of unbounded all-combinations claims.

B:

This preventive step mitigates a different project risk (syllabus section 1.3): A startup insists the same scripted suite is appropriate for a prototype game, regulated payment processor, and embedded vehicle controller. The targeted safeguard for the current case is: Use risk assessment and systematic selection instead of unbounded all-combinations claims.

C:

This preventive step mitigates a different project risk (syllabus section 1.4): An engineer records all tests as passed because the execution script returned exit code zero, although assertions were skipped in one module. The targeted safeguard for the current case is: Use risk assessment and systematic selection instead of unbounded all-combinations claims.

Question 85

In a fictional application-delivery project, the team reports: A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. Which testing activity or corrective action best addresses this situation?

  1. Re-evaluate test coverage when requirements and operating conditions evolve.
  2. Use defect clustering as one input while also assessing new integration and business risks.
  3. Qualify the results as risk-limited evidence and continue appropriate vulnerability and misuse-case testing.
  4. Create timely collaborative triage and feedback channels without losing objective test judgment.

Explanation

Correct Answer

A:

The targeted action is: Re-evaluate test coverage when requirements and operating conditions evolve. It addresses the underlying software-testing principle: Testing is context-dependent and prior passing evidence is not a permanent guarantee. The relevant confirming evidence is: The next release includes new cases for changed workflows and likely failure modes.

Incorrect Answers

B:

This choice is a useful response to a different testing situation (section 1.3, Testing Principles): A mobile game team decides to test only its newest animations after finding many prior defects there, overlooking a newly connected payment component. The present problem instead depends on: Testing is context-dependent and prior passing evidence is not a permanent guarantee.

C:

This choice is a useful response to a different testing situation (section 1.3, Testing Principles): A network management tool is checked against all known requirements but the team interprets passing tests as mathematical proof that no vulnerabilities exist. The present problem instead depends on: Testing is context-dependent and prior passing evidence is not a permanent guarantee.

D:

This choice is a useful response to a different testing situation (section 1.5, Essential Skills and Good Practices in Testing): A highly independent external test group has no access to developers for two weeks, so straightforward failures persist despite excellent defect reports. The present problem instead depends on: Testing is context-dependent and prior passing evidence is not a permanent guarantee.

Question 86

In a fictional application-delivery project, the team reports: A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. Which observation best verifies that the stated testing issue is addressed?

  1. The release summary states tested threat models and open residual security concerns.
  2. The safety-critical component has traceable regulated controls while the game prototype uses proportionate exploratory coverage.
  3. Traceability shows new feature conditions and the cases added or updated for them.
  4. The next release includes new cases for changed workflows and likely failure modes.

Explanation

Correct Answer

D:

This is the expected verification outcome: The next release includes new cases for changed workflows and likely failure modes. It directly checks the corrective activity (Re-evaluate test coverage when requirements and operating conditions evolve.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A network management tool is checked against all known requirements but the team interprets passing tests as mathematical proof that no vulnerabilities exist. It does not establish the required result for this case: The next release includes new cases for changed workflows and likely failure modes.

B:

This result may validate another testing scenario: A startup insists the same scripted suite is appropriate for a prototype game, regulated payment processor, and embedded vehicle controller. It does not establish the required result for this case: The next release includes new cases for changed workflows and likely failure modes.

C:

This result may validate another testing scenario: A tester receives a new feature after a sprint begins but continues executing only tests from the previous backlog without updating the intended scope. It does not establish the required result for this case: The next release includes new cases for changed workflows and likely failure modes.

Question 87

In a fictional application-delivery project, the team reports: A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. Which testing concept or underlying cause best explains the reported problem?

  1. Testing depends on context, including domain, risk, constraints and development lifecycle.
  2. Defect concentration is useful but does not override changed risk or guarantee where new defects will appear.
  3. Independence does not replace domain knowledge, collaboration or a reliable test basis.
  4. Testing is context-dependent and prior passing evidence is not a permanent guarantee.

Explanation

Correct Answer

D:

The most relevant explanation is: Testing is context-dependent and prior passing evidence is not a permanent guarantee. This describes why the original situation (A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month.) merits the response: Re-evaluate test coverage when requirements and operating conditions evolve.

Incorrect Answers

A:

This principle could explain a different testing issue: A startup insists the same scripted suite is appropriate for a prototype game, regulated payment processor, and embedded vehicle controller. The present case is better explained by: Testing is context-dependent and prior passing evidence is not a permanent guarantee.

B:

This principle could explain a different testing issue: A mobile game team decides to test only its newest animations after finding many prior defects there, overlooking a newly connected payment component. The present case is better explained by: Testing is context-dependent and prior passing evidence is not a permanent guarantee.

C:

This principle could explain a different testing issue: An outsourcing firm creates a separate test organization without domain context and praises its independence even though it mislabels legitimate billing rules as defects. The present case is better explained by: Testing is context-dependent and prior passing evidence is not a permanent guarantee.

Question 88

In a fictional application-delivery project, the team reports: A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Require cautious evidence language and independent risk review for security claims.
  2. Monitor external changes and maintain contract fixtures as part of test maintenance.
  3. Link test refresh decisions to significant changes in product and risk.
  4. Define user-relevant quality criteria before selecting tests.

Explanation

Correct Answer

C:

This safeguard specifically targets the contributing cause: Link test refresh decisions to significant changes in product and risk. It addresses the principle (Testing is context-dependent and prior passing evidence is not a permanent guarantee.) and can be assessed by: The next release includes new cases for changed workflows and likely failure modes.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 1.3): A network management tool is checked against all known requirements but the team interprets passing tests as mathematical proof that no vulnerabilities exist. The targeted safeguard for the current case is: Link test refresh decisions to significant changes in product and risk.

B:

This preventive step mitigates a different project risk (syllabus section 1.3): A tax service shows repeated successful automated results but its external rate provider changes an API contract overnight. The targeted safeguard for the current case is: Link test refresh decisions to significant changes in product and risk.

D:

This preventive step mitigates a different project risk (syllabus section 1.2): A weather-app team measures software quality solely by the total defects found, overlooking a slow startup that users abandon. The targeted safeguard for the current case is: Link test refresh decisions to significant changes in product and risk.

Question 89

A tester is asked to evaluate the following situation: A delivery startup finds no defects in hundreds of low-value footer checks while its checkout flow continues losing orders. Which testing activity or corrective action best addresses this situation?

  1. Reallocate test effort toward the business-critical checkout failure cluster.
  2. Re-evaluate test coverage when requirements and operating conditions evolve.
  3. Use defect clustering as one input while also assessing new integration and business risks.
  4. Raise the missing condition during review and request clarification while the test basis is being refined.

Explanation

Correct Answer

A:

The targeted action is: Reallocate test effort toward the business-critical checkout failure cluster. It addresses the underlying software-testing principle: Defects often cluster in a small number of components or functions rather than being evenly distributed. The relevant confirming evidence is: Checkout failure frequency and severity decrease after targeted tests identify the main defects.

Incorrect Answers

B:

This choice is a useful response to a different testing situation (section 1.3, Testing Principles): A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. The present problem instead depends on: Defects often cluster in a small number of components or functions rather than being evenly distributed.

C:

This choice is a useful response to a different testing situation (section 1.3, Testing Principles): A mobile game team decides to test only its newest animations after finding many prior defects there, overlooking a newly connected payment component. The present problem instead depends on: Defects often cluster in a small number of components or functions rather than being evenly distributed.

D:

This choice is a useful response to a different testing situation (section 1.4, Test Activities, Testware and Test Roles): A test analyst discovers a missing cancellation condition in a requirement but remains silent because code has not been written and there is no failing executable test. The present problem instead depends on: Defects often cluster in a small number of components or functions rather than being evenly distributed.

Question 90

A tester is asked to evaluate the following situation: A delivery startup finds no defects in hundreds of low-value footer checks while its checkout flow continues losing orders. Which observation best verifies that the stated testing issue is addressed?

  1. The next release includes new cases for changed workflows and likely failure modes.
  2. Checkout failure frequency and severity decrease after targeted tests identify the main defects.
  3. The test plan documents selected coverage and risk-based omissions within the available time.
  4. Tests begin with usable resources and product defects are distinguished from environmental blockers.

Explanation

Correct Answer

B:

This is the expected verification outcome: Checkout failure frequency and severity decrease after targeted tests identify the main defects. It directly checks the corrective activity (Reallocate test effort toward the business-critical checkout failure cluster.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: A newly launched API passes all tests, so product leadership claims no further testing is needed even though the business model will change next month. It does not establish the required result for this case: Checkout failure frequency and severity decrease after targeted tests identify the main defects.

C:

This result may validate another testing scenario: A travel-site team executes every conceivable destination, browser, payment, and language combination in its test plan despite an impossible schedule. It does not establish the required result for this case: Checkout failure frequency and severity decrease after targeted tests identify the main defects.

D:

This result may validate another testing scenario: A release manager orders test execution before the shared environment, data and access rights exist and then treats every infrastructure failure as a product defect. It does not establish the required result for this case: Checkout failure frequency and severity decrease after targeted tests identify the main defects.