CTFL-AT Exam Dumps : Certified Tester Foundation Level Agile Tester

 Scrum is an agile development approach that incorporates the following practices:

• a project is divided into iterations called sprints, which are typically 2-4 weeks long
• each sprint starts with a planning meeting, where the team selects a subset of user stories from the product backlog to work on
• each sprint ends with a review meeting, where the team demonstrates the potentially releasable/shippable product increment to the stakeholders and collects feedback
• each sprint also includes a retrospective meeting, where the team reflects on the process and identifies areas for improvement123 References: 1: ISTQB® Foundation Level Agile Tester Syllabus, Section 2.1, Agile Software Development1; 2: ASTQB Agile Tester Certification Resources, Section 2.1, Agile Software Development2; 3: What is Agile? | Atlassian3

The best black box test design technique for verifying the accuracy of this user story is equivalence partitioning. Equivalence partitioning is a technique that divides the input domain of a system into classes or groups that are expected to behave similarly. By testing one value from each class, the tester can reduce the number of test cases while still achieving good coverage. In this case, the input domainof the system is the amount of income, which can be divided into classes based on the tax percentage applied to different income ranges. For example, if the tax percentage is 10% for income below 10,000, 20% for income between 10,000 and 20,000, and 30% for income above 20,000, then the equivalence classes are: low income (<10,000), medium income (10,000-20,000), and high income (>20,000). By testing one value from each class, such as 5,000, 15,000, and 25,000, the tester can verify that the system calculates the correct tax percentage for each income range. This technique is more efficient and effective than testing all possible values of income, or testing only one value of income, or testing the states of income entry, or testing the statements in income calculation. References: ISTQB Foundation Level Agile Tester Syllabus1, Section 2.3.1, page 19; ISTQB Foundation Level Agile Tester Extension Sample Exam Questions2, Question 5, page 6.

 Equivalence partitioning is a black-box test design technique that divides the input domain of a system into classes of data from which test cases can be derived. The idea is that if a system works correctly for a representative value from an equivalence class, it will work correctly for all values from that class, and vice versa. Equivalence partitioning reduces the number of test cases by eliminating redundant ones. For the given user story, equivalence partitioning is the most suitable technique because it can test the different outcomes of the annual car tax calculation based on the power of the vehicle, which is the main input for the system. By testing one value from each partition, the tester can verify the functionality of the system and detect any errors in the calculation logic. The other techniques are not as suitable because they do not focus on the inputdomain of the system, but rather on the conditions, transitions, or scenarios that are not directly related to the user story. References:

• : ISTQB® Foundation Level Agile Tester Syllabus, Version 2014, Section 2.2.2
• : ASTQB Agile Tester Certification Resources, Agile Testing Foundations, Chapter 3, Section 3.2.2
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