- A
LEF = Threat Event Frequency × Vulnerability
Correct formula.
- B
LEF = Threat Event Frequency + Vulnerability
Why wrong: Addition is not correct; LEF is a product.
- C
LEF = Asset Value × Vulnerability
Why wrong: That relates to loss magnitude, not frequency.
- D
LEF = Annualized Rate of Occurrence × Single Loss Expectancy
Why wrong: That is ALE, not LEF.
Question 433 of 1,000
CRISC IT Risk Assessment Practice Question
This CRISC practice question tests your understanding of it risk assessment. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In the FAIR framework, which of the following correctly represents the calculation of Loss Event Frequency (LEF)?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LEF = Threat Event Frequency × Vulnerability
In the FAIR (Factor Analysis of Information Risk) framework, Loss Event Frequency (LEF) is calculated as the product of Threat Event Frequency (TEF) and Vulnerability (Vuln). This reflects that the frequency of loss events depends on how often a threat event occurs and the probability that the threat event will result in a loss, which is the vulnerability component. The multiplication captures the dependency: even if threats are frequent, low vulnerability reduces LEF, and vice versa.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
LEF = Threat Event Frequency × Vulnerability
Why this is correct
Correct formula.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
LEF = Threat Event Frequency + Vulnerability
Why it's wrong here
Addition is not correct; LEF is a product.
- ✗
LEF = Asset Value × Vulnerability
Why it's wrong here
That relates to loss magnitude, not frequency.
- ✗
LEF = Annualized Rate of Occurrence × Single Loss Expectancy
Why it's wrong here
That is ALE, not LEF.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse LEF with ALE or mistakenly think vulnerability is additive, leading them to choose Option B or D, but FAIR explicitly defines LEF as a product of TEF and vulnerability, not a sum or a monetary metric.
Detailed technical explanation
How to think about this question
Under the hood, FAIR decomposes LEF into TEF (how often a threat agent initiates a threat event) and Vulnerability (the probability that a threat event will result in a loss, often derived from control strength and threat capability). For example, if a phishing campaign occurs 100 times per year (TEF) and the vulnerability (probability of a user clicking) is 0.05, then LEF = 100 × 0.05 = 5 loss events per year. This multiplicative relationship is critical because it allows risk analysts to separately assess threat frequency and control effectiveness, enabling targeted mitigation strategies.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CRISC exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this CRISC question test?
IT Risk Assessment — This question tests IT Risk Assessment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: LEF = Threat Event Frequency × Vulnerability — In the FAIR (Factor Analysis of Information Risk) framework, Loss Event Frequency (LEF) is calculated as the product of Threat Event Frequency (TEF) and Vulnerability (Vuln). This reflects that the frequency of loss events depends on how often a threat event occurs and the probability that the threat event will result in a loss, which is the vulnerability component. The multiplication captures the dependency: even if threats are frequent, low vulnerability reduces LEF, and vice versa.
What should I do if I get this CRISC question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This CRISC practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CRISC exam.
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