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ISQI ISTQB Certified Tester Foundation Level (CTFL) v4.0 認定 CTFL_Syll_4.0 試験問題 (Q173-Q178):

質問 # 173
Which of the following statements is true?

A. Testers who perform functional tests are generally expected to have more technical skills than testers who perform non-functional tests
B. Non-functional testing includes testing of both technical and non-technical quality characteristics
C. Functional testing focuses on what the system should do while non-functional testing on the internal structure of the system
D. The test techniques that can be used to design white-box tests are described in the ISO/IEC 25010 standard

正解：B

解説：
Explanation
Non-functional testing includes testing of both technical and non-technical quality characteristics.
Non-functional testing is the process of testing the quality attributes of a system, such as performance, usability, security, reliability, etc. Non-functional testing can be applied at any test level and can use both black-box and white-box test techniques. Non-functional testing can cover both technical aspects, such as response time, throughput, resource consumption, etc., and non-technical aspects, such as user satisfaction, accessibility, compliance, etc. Therefore, option B is the correct answer.
References: ISTQB Certified Tester Foundation Level Syllabus v4.01, Section 1.3.1, page 13; ISTQB Glossary v4.02, page 40.

質問 # 174
The whole-team approach:

A. is mostly adopted in projects aimed at developing safety-critical systems, as it ensures the highest level of testing independence
B. promotes the idea that all team members should be responsible for the quality of the product
C. is a consensus-based approach that engages the whole team in estimating the user stories
D. promotes the idea that all team members should have a thorough understanding of test techniques

正解：B

解説：
This answer is correct because the whole-team approach is a way of working in agile projects where all team members share the responsibility for the quality of the product, and collaborate on delivering value to the customer. The whole-team approach involves testers, developers, business analysts, product owners, and other stakeholders in planning, designing, developing, testing, and delivering the product. The whole-team approach fosters communication, feedback, learning, and continuous improvement within the team. References: ISTQB Glossary of Testing Terms v4.0, ISTQB Foundation Level Syllabus v4.0, Section 3.1.1.1

質問 # 175
Which of the following statements is true?

A. A defect does not always produce a failure, while a bug always produces a failure
B. A defect may cause a failure which, when occurring, always causes an error
C. Bugs are defects found during component testing, while failures are defects found at higher test levels
D. Failures can be caused by defects, but also by environmental conditions

正解：D

解説：
Failures can be caused by defects, but also by environmental conditions. A failure is an event in which the software system does not perform a required function or performs a function incorrectly, according to the expected behavior. A defect is a flaw in the software system or a deviation from the requirements or the specifications, that may cause a failure. However, not all failures are caused by defects, as some failures may be caused by environmental conditions, such as hardware malfunctions, network interruptions, power outages, incompatible configurations, etc. Environmental conditions are factors that affect the operation of the software system, but are not part of the software system itself. The other statements are false, because:
* A defect does not always produce a failure, while a bug always produces a failure. This statement is false, because a defect may or may not produce a failure, depending on the inputs, the outputs, the states, or the scenarios of the software system, and a bug is just another term for a defect, so it has the same possibility of producing a failure as a defect. For example, a defect in a rarely used feature or a hidden branch of the code may never produce a failure, while a defect in a frequently used feature or a critical path of the code may produce a failure often. A bug is not a different concept from a defect, but rather a synonym or a colloquial term for a defect, so it has the same definition and implications as a defect.
* A defect may cause a failure which, when occurring, always causes an error. This statement is false, because an error is not a consequence of a failure, but rather a cause of a defect. An error is a human action or a mistake that produces a defect in the software system, such as a typo, a logic flaw, a requirement misunderstanding, etc. An error is not observable in the software system, but rather in the human mind or the human work products, such as the code, the design, the documentation, etc. A failure is not a cause of an error, but rather a result of a defect, which is a result of an error. For example, an error in the code may cause a defect in the software system, which may cause a failure in the software behavior.
* Bugs are defects found during component testing, while failures are defects found at higher test levels.
This statement is false, because bugs and failures are not different types of defects, but rather different terms for defects and their manifestations. As mentioned before, bugs are just another word for defects, and failures are the events in which the software system does not perform as expected due to defects.
Bugs and failures can be found at any test level, not only at component testing or higher test levels. Test levels are the stages of testing that correspond to the levels of integration of the software system, such as component testing, integration testing, system testing, and acceptance testing. Defects and failures can occur and be detected at any test level, depending on the test objectives, the test basis, the test techniques, and the test environment. References: ISTQB Certified Tester Foundation Level (CTFL) v4.
0 sources and documents:
* ISTQB Certified Tester Foundation Level Syllabus v4.0, Chapter 1.1.2, Testing and Quality1
* ISTQB Certified Tester Foundation Level Syllabus v4.0, Chapter 1.2.1, Testing Principles1
* ISTQB Certified Tester Foundation Level Syllabus v4.0, Chapter 1.3.1, Testing in Software Development Lifecycles1
* ISTQB Glossary of Testing Terms v4.0, Failure, Defect, Bug, Environmental Condition, Error, Test Level2

質問 # 176
Which ONE of the following statements does NOT describe how testing contributes to higher quality?

A. Software testing identifies defects, which can be used to improve development activities.
B. Properly designed tests that pass reduce the level of risk in a system.
C. Performing a review of the requirement specifications before implementing the system can enhance quality.
D. The testing of software demonstrates the absence of defects.

正解：D

解説：
* The testing of software does not demonstrate the absence of defects, but rather the presence of defects or the conformance of the software to the specified requirements1. Testing can never prove that the software is defect-free, as it is impossible to test all possible scenarios, inputs, outputs, and behaviors of the software2. Testing can only provide a level of confidence in the quality of the software, based on the coverage, effectiveness, and efficiency of the testing activities3.
* The other options are correct because:
* A. Properly designed tests that pass reduce the level of risk in a system, as they verify that the system meets the expected quality attributes and satisfies the needs and expectations of the users and clients4. Risk is the potential for loss or harm due to the occurrence of an undesirable event5. Testing can help to identify, analyze, prioritize, and mitigate the risks associated with the software product and project6.
* C. Software testing identifies defects, which can be used to improve development activities, as they provide feedback on the quality of the software and the effectiveness of the development processes7. Defects are flaws or errors in the software that cause it to deviate from the expected or required results or behavior. Testing can help to detect, report, track, and resolve the defects, and prevent them from recurring in the future.
* D. Performing a review of the requirement specifications before implementing the system can enhance quality, as it can ensure that the requirements are clear, complete, consistent, testable, and aligned with the needs and expectations of the users and clients. Requirements are the specifications of what the software should do and how it should do it. Testing can help to validate that the requirements are met by the software, and verify that the software is implemented according to the requirements.
References =
* 1 ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 10
* 2 ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 11
* 3 ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 12
* 4 ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 13
* 5 ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 97
* 6 ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 98
* 7 ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 14
* [8] ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 15
* [9] ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 16
* [10] ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 17
* [11] ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 18
* [12] ISTQB Certified Tester Foundation Level Syllabus v4.0, 2023, p. 19

質問 # 177
A company wants to reward each of its salespeople with an annual bonus that represents the sum of all the bonuses accumulated for every single sale made by that salesperson. The bonus for a single sale can take on the following four values: 3%, 5%, 7% and 10% (the percentage refers to the amount of the single sale). These values are determined on the basis of the type of customer (classified as "Basic" or "Premium") to which such sale was made, and on the amount of such sale classified into the following three groups G1, G2 and G3:
* [G1]: less than 300 euros
* [G2]: between 300 and 2000 euros
* [G3]: greater than 2000 euros
Which of the following is the minimum number of test cases needed to cover the full decision table associated with this scenario?

A. 0
B. 1
C. 2
D. 3

正解：A

解説：
The minimum number of test cases needed to cover the full decision table associated with this scenario is 6. This is because the decision table has 4 conditions (type of customer and amount of sale) and 4 actions (bonus percentage). The conditions have 2 possible values each (Basic or Premium, and G1, G2 or G3), so the total number of combinations is 2 x 2 x 2 x 2 = 16. However, not all combinations are valid, as some of them are contradictory or impossible. For example, a sale cannot be both less than 300 euros and greater than 2000 euros at the same time. Therefore, we need to eliminate the invalid combinations and keep only the valid ones. The valid combinations are:
Type of customer
Amount of sale
Bonus percentage
Basic
G1
3%
Basic
G2
5%
Basic
G3
7%
Premium
G1
5%
Premium
G2
7%
Premium
G3
10%
These 6 combinations cover all the possible values of the conditions and actions, and they are the minimum number of test cases needed to cover the full decision table.

質問 # 178
......

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ISQI ISTQB Certified Tester Foundation Level (CTFL) v4.0 認定 CTFL_Syll_4.0 試験問題 (Q173-Q178):

一番優秀なCTFL_Syll_4.0日本語独学書籍試験-試験の準備方法-権威のあるCTFL_Syll_4.0ウェブトレーニング

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