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ISTQB-CTFL Exam - Topic 6 Question 61 Discussion

A software application incorrectly provided customers discounts of 50% off their total purchases if the purchases exceeded S100. It was discovered through an audit that the discount should have been only 5% off these purchases. A root cause analysis uncovered that the requirements Incorrectly stated 50% instead of 5% in this scenario.Which of the following MOST accurately reflects this scenario?
B) The incorrect customer discount is the effect and the reason for the requirement error is the root cause
A) The audit finding Is the root cause, the incorrect calculation of 50% Is the defect, and the Incorrect requirement Is the effect
C) The incorrect discount is the root cause, requiring a root cause analysis which led to investigating the software code, design, and requirements
D) A defect in the code is determined to be the root cause of the incorrect calculation

ISTQB-CTFL Exam - Topic 6 Question 61 Discussion

Actual exam question for ISTQB's ISTQB-CTFL exam
Question #: 61
Topic #: 6
[All ISTQB-CTFL Questions]

A software application incorrectly provided customers discounts of 50% off their total purchases if the purchases exceeded S100. It was discovered through an audit that the discount should have been only 5% off these purchases. A root cause analysis uncovered that the requirements Incorrectly stated 50% instead of 5% in this scenario.

Which of the following MOST accurately reflects this scenario?

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Suggested Answer: B

According to the ISTQB CTFL syllabus, a defect is a deviation from the expected result which in this scenario is the incorrect discount applied to the customers. The root cause, as per the ISTQB definition, is the originating cause of a defect, which in this case is the incorrect requirement stating 50% instead of 5%. Therefore, the incorrect requirement is the root cause and the customer receiving the wrong discount is the effect of this root cause. Reference: ISTQB Certified Tester Foundation Level Syllabus v4.0, Section 1.4.3 'Defects, Root Causes, and Effects'.


by France at Jun 17, 2026, 07:36 AM

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