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ISTQB-Foundation Level Exam ISTQB-CTFL Prüfungsfragen mit Lösungen (Q174-Q179):

174. Frage
Mark the correct sentences:
* Defects are a result of environmental conditions and are also referred to as "Failures"
* A human mistake may produce a defect
* A system mil totally fail to operate correctly when a failure exists in it
* When a defect exists in a system it may result in a failure
* Defects occur only as a result of technology changes

A. II, IV
B. II, III, IV
C. IV, V
D. I, II

Antwort: A

Begründung:
* The question is about marking the correct sentences among the given statements related to defects, failures, and mistakes. According to the ISTQB glossary, the definitions of these terms are1:
* Defect: A flaw in a component or system that can cause the component or system to fail to perform its required function, e.g. an incorrect statement or data definition. A defect, if encountered during execution, may cause a failure of the component or system.
* Failure: An event in which a component or system does not perform a required function within specified limits.
* Mistake: A human action that produces an incorrect result.
* Therefore, out of the five given statements, only two are correct, namely:
* A human mistake may produce a defect: This is true, as a mistake is a source or cause of a defect, e.g. a programmer may make a mistake in writing a code statement, which results in a defect in the software component.
* When a defect exists in a system it may result in a failure: This is true, as a defect is a potential or actual cause of a failure, e.g. a defect in the software component may cause the system to fail to perform a required function when the defect is encountered during execution.
* The other three statements are incorrect, namely:
* Defects are a result of environmental conditions and are also referred to as "Failures": This is false, as defects are not a result of environmental conditions, but of mistakes or other factors, and defects are not the same as failures, but rather the causes of failures.
* A system will totally fail to operate correctly when a failure exists in it: This is false, as a system may not necessarily fail completely or stop operating when a failure occurs, but may continue to operate with reduced functionality or performance, or with incorrect results.
* Defects occur only as a result of technology changes: This is false, as defects can occur due to various reasons, not only technology changes, such as human mistakes, design flaws, requirement changes, hardware failures, etc.
References:
* 1: ISTQB Glossary of Testing Terms 4.0, 2023, available at ISTQB) and ASTQB).

175. Frage
Consider a review for a high-level architectural document written by a software architect. The architect does most of the review preparation work, including distributing the document to reviewers before the review meeting. However, reviewers are not required to analyze the document in advance, and during the review meeting the software architect explains the document step by step. The only goal of this review is to establish a common understanding of the software architecture that will be used in a software development project.
Which of the following review types does this review refer to?

A. Audit
B. Inspection
C. Informal review
D. Walkthrough

Antwort: D

Begründung:
This answer is correct because a walkthrough is a type of review where the author of the work product leads the review process and explains the work product to the reviewers. The reviewers are not required to prepare for the review in advance, and the main objective of the walkthrough is to establish a common understanding of the work product and to identify any major defects or issues. A walkthrough is usually informal and does not follow a defined process or roles. In this case, the review for a high-level architectural document written by a software architect matches the characteristics of a walkthrough. References: ISTQB Glossary of Testing Terms v4.0, ISTQB Foundation Level Syllabus v4.0, Section 2.4.2.2

176. Frage
Which type of software development product can undergo static testing?

A. Static testing is done only on the requirements You need to execute the software in order to find defects in the code.
B. Static tests should be performed on the installation and user guide documents as these documents are used by the end user.
C. Static testing is done only on the code as part of the "code review" sessions Other documents are reviewed, but not by static testing.
D. Any software development product can undergo static testing, including requirements specifications, design specifications and code.

Antwort: D

Begründung:
Static testing is a form of testing that does not involve executing the software, but rather analyzing it for defects, errors, or violations of standards. Static testing can be applied to any software development product, including requirements specifications, design specifications, code, test cases, test plans, user manuals, etc.
Static testing can be done by using various techniques such as reviews, inspections, walkthroughs, checklists, static analysis tools, etc. Verified References: A Study Guide to the ISTQB® Foundation Level 2018 Syllabus
- Springer, page 7.

177. Frage
In maintenance testing, what is the relationship between impact analysis and regression testing?

A. There is no relationship between impact analysis and regression testing.
B. Impact analysis requires a regression testing for only the tests that have detected faults in previous SW release
C. Impact analysis requires a regression testing for all program elements which were newly integrated (new functionalities).
D. The impact analysis is used to evaluate the amount of regression testing to be performed.

Antwort: D

Begründung:
In maintenance testing, the relationship between impact analysis and regression testing is that the impact analysis is used to evaluate the amount of regression testing to be performed. Maintenance testing is a type of testing that is performed on an existing software product after it has been delivered or deployed, in order to ensure that it still meets its requirements and functions correctly after a change or a modification.
Maintenance testing can be triggered by various reasons, such as corrective maintenance (fixing defects), adaptive maintenance (adapting to new environments), perfective maintenance (improving performance), preventive maintenance (avoiding future problems), etc. Impact analysis is a technique that is used to assess the extent and nature of changes introduced by maintenance activities on the software product or project.
Impact analysis helps to identify which parts of the software product are affected by the changes, which parts need to be modified or updated accordingly, which parts need to be retested or verified for correctness or compatibility, etc. Regression testing is a type of testing that verifies that previously tested software still performs correctly after a change or a modification. Regression testing helps to detect any side effects or unintended consequences of maintenance activities on the software product's functionality or quality.
Regression testing can be performed at various levels and scopes depending on the impact analysis results.
Therefore, in maintenance testing, impact analysis is used to evaluate the amount of regressiontesting to be performed. Verified References: A Study Guide to the ISTQB® Foundation Level 2018 Syllabus -Springer, page 20.

178. Frage
A team's test strategy was to invest equal effort in testing each of a system's modules. After running one test cycle, it turned out that most of the critical bugs were detected in one of the system's modules.
Which testing principal suggests a change to the current test strategy for the next test cycle?

A. Pesticide Paradox
B. Defect clustering
C. Absence-of-errors fallacy
D. Early testing

Antwort: B

Begründung:
Defect clustering is a testing principle that states that a small number of modules contain most of the defects detected during pre-release testing, or are responsible for most of the operational failures. Defect clustering can be explained by Pareto's principle (also known as the 80-20 rule), which states that approximately 80% of the problems are found in 20% of the modules. Defect clustering suggests a change to the current test strategy for the next test cycle, as it implies that more effort should be allocated to test the modules that have shown high defect density or criticality. Pesticide paradox is another testing principle that states that if the same tests are repeated over and over again, eventually they will no longer find any new defects. Pesticide paradox suggests a change to the current test strategy for the next test cycle, but not based on defect clustering, but rather on test diversity and coverage. Early testing is a testing principle that states that testing activities should start as early as possible in the software development life cycle and should be focused on defined objectives.
Early testing does not suggest a change to the current test strategy for the next test cycle, but rather a proactive approach to prevent defects from occurring or propagating. Absence-of-errors fallacy is a testing principle that states that finding and fixing defects does not help if the system built is unusable and does not fulfill the users' needs and expectations. Absence-of-errors fallacy does not suggest a change to the current test strategy for the next test cycle, but rather a focus on quality attributes and user requirements. Verified References: A Study Guide to the ISTQB Foundation Level 2018 Syllabus - Springer, Chapter 1, page 9-10.

179. Frage
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