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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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Beth
3 days ago
I lean towards D. The defect in the code is the main issue.
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Vivan
8 days ago
I feel like A is more accurate. The audit finding is key.
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Willard
14 days ago
This is tricky. I think B makes sense.
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Casie
19 days ago
The audit just pointed out the problem, not the root cause itself.
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Samira
24 days ago
Nah, I disagree, the defect is definitely the calculation, not the requirements.
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Truman
29 days ago
Wait, how did they mix up 50% with 5%? That's wild!
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Sylvia
1 month ago
I think B makes the most sense here.
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Peggie
1 month ago
The requirements were wrong from the start, that's the real issue.
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Craig
1 month ago
I’m confused about the terms here. I thought the effect was what we see happening, so maybe C makes sense since it talks about the investigation leading to the root cause?
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Ahmed
2 months ago
I practiced a question similar to this where the defect was misidentified. I think D could be misleading since it focuses too much on the code itself.
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Jacqueline
2 months ago
I'm not entirely sure, but I feel like the incorrect requirement is definitely a key part of this. Maybe A is closer to the truth?
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Joni
2 months ago
I remember we discussed how the root cause should be the underlying issue, not just the symptoms. I think B might be the right choice.
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