Which sampling methodology is primarily used to detect significant deficiencies?

CISA By islever Editorial Last updated

Short answer

A Discovery sampling is the sampling methodology primarily used to detect significant deficiencies such as fraud or critical control weaknesses.

Question

Which of the following sampling methodologies is PRIMARILY used to detect significant deficiencies?
  1. Discovery sampling Correct Answer
  2. Compliance testing
  3. Attribute sampling
  4. Substantive testing

Key Takeaways

The question tests your ability to distinguish sampling methodologies; the trap is confusing the broader attribute sampling technique with discovery sampling's unique purpose of detecting critical exceptions.

This CISA study page explains that discovery sampling is the sampling methodology primarily used to detect significant deficiencies, such as fraud or critical control failures, and analyzes why the other options are not correct.

Common mistake: Choosing attribute sampling because discovery sampling is a subtype of attribute sampling; however, attribute sampling estimates an occurrence rate, while discovery sampling is specifically designed to uncover rare, significant deficiencies.

Expert Analysis

Why the Answer Is Correct

Discovery sampling is a special application of attribute sampling designed for situations where the expected occurrence rate is very low but the potential impact is severe. It is primarily used to detect significant deficiencies, including fraud, critical control weaknesses, or other major irregularities, because its sample size is calculated to provide a high probability of finding at least one occurrence when such a condition exists in the population.

Why the Other Options Are Wrong

B. Compliance testing is an audit procedure, not a sampling methodology; it typically uses attribute sampling to test whether controls operate effectively. C. Attribute sampling is broader and is used to estimate the rate of occurrence of a characteristic within a population, not specifically to discover rare, significant deficiencies. D. Substantive testing is designed to detect material monetary errors or misstatements in transactions or account balances, not to detect control deficiencies. Among the presented choices, discovery sampling is the term that directly aligns with the goal of detecting significant deficiencies.

Community Comment Notes

Most comments support discovery sampling, noting that it is used to discover errors, irregularities, or other significant issues in a population. One commenter argued for attribute sampling because it measures the presence or absence of a characteristic, but that view overlooks the distinct purpose of discovery sampling in situations where the expected occurrence rate is very low and the target is a significant or rare deficiency.

Exam Strategy

Remember that discovery sampling is a directed, low expected-rate variant of attribute sampling; exam questions that use the phrase significant deficiencies or fraud are pointing you toward discovery. Eliminate compliance and substantive testing because they focus on controls or monetary amounts, not rare control failures.

Frequently Asked Questions

Why is discovery sampling preferred for significant deficiencies over ordinary attribute sampling?

Discovery sampling is a special attribute sampling use case: it is designed to give a high chance of detecting at least one instance when the population exception rate is very low, such as fraud or a critical control deficiency.

Does discovery sampling measure an error rate?

No. It is mainly a detection tool, not an estimator of occurrence rate. Because it targets rare, significant exceptions, a finding in the sample triggers further investigation rather than a reliable rate estimate.

More CISA FAQ →

Community Votes

A
60%
C
40%

60% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 3 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 3

  1. Swallows 👍 2 Answered A
    Discovery sampling is primarily used to detect significant deficiencies by examining a sample with the intent of discovering errors, irregularities, or other significant issues that might exist within a population. This method is particularly useful when there is a suspicion of fraud, errors, or other significant problems that may not be apparent through other sampling methodologies.
  2. a84n 👍 2 Answered C
    Answer C attribute sampling is specifically designed to assess the presence or absence of specific attributes or characteristics within a population
  3. RS66 👍 1 Answered A
    A. Discovery sampling

Reader comments & corrections

No reader corrections yet — spotted an error or have a note? Share it below.

Log in to comment, report an error, or add a note about this question.

Greatest Fraud Risk: Mandatory Leave vs Access Reviews

S-grade

Environmental Detector Placement Risks in Data Centers

S-grade

Next Step When Periodic Access Reviews Are Missing | CISA

S-grade

Best Backup Scheme for Rapid Data Restoration?

S-grade

Practice All CISA Questions

Access 400 questions with complete answers and detailed explanations.

View Full CISA Practice Test →

← Back to CISA Study Guide