What Drives the Nature, Timing, and Extent of Audit Procedures?

Answer B. Observation provides direct evidence of how a control operated at the moment the auditor watched it, but it is limited to that point in time. Seeing the control performed properly for one afternoon does not, by itself, support a conclusion that it operated effectively for all of Year 2. The auditor would need additional procedures (for example, inquiry, inspection of records, or reperformance at other times) to support operation over a broader period.

Why not A: This is tempting because the auditor directly observed the control, but a single observation cannot demonstrate consistent operation over an entire year; the choice overgeneralizes point-in-time evidence.

Why not C: This distractor relies on the observer-effect idea, but observation is generally more persuasive than inquiry alone. The primary limitation of observation is its timing (point-in-time), not that it is inherently less reliable than inquiry.

Why not D: Observing a control briefly does not provide assurance about the completeness and accuracy of all transactions for the year; substantive testing and evidence covering the period would be required.

Answer B. Because controls are not operating and the contracts include usage-based variable fees, the auditor needs transaction‑level and external evidence rather than relying on high‑level analytics or internal documents alone. Inspecting contracts addresses recognition and measurement of variable consideration, confirmations and subsequent cash collections provide independent evidence of existence and collectibility, and cutoff testing ensures revenue is recorded in the proper period.

Why not A: While confirmations and cutoff testing address existence and timing, they omit direct evaluation of customer-specific contract terms and variable fees and do not include subsequent collection testing, procedures necessary when inherent and control risk are elevated.

Why not C: Relying on internal documents and prior-year control results is inappropriate when current controls are not operating effectively; internal evidence and management representations are not adequate substitutes for external confirmations and contract inspection.

Why not D: Analytical procedures and management representations are useful but lack the independence and transaction-level detail needed to test complex contract terms and variable consideration when controls are ineffective.

Answer C. When evidence from different sources is inconsistent, the auditor must investigate and perform additional procedures to obtain sufficient appropriate evidence. Inquiry alone or a management representation does not resolve conflicting documentary evidence. Inspecting the full contract and related communications is an appropriate substantive procedure to determine whether extended return rights exist and whether revenue recognition was proper.

Why not A: Tempting because inquiry is a valid procedure, but once contradictory documentary evidence is discovered the auditor cannot simply accept an oral explanation without follow-up. The inconsistency requires additional corroborating procedures.

Why not B: Written representations supplement audit evidence but do not substitute for performing substantive procedures when other evidence suggests a possible misstatement. The auditor still needs independent corroboration.

Why not D: Subsequent cash collection may support existence and collectability but does not address the terms of the sale (for example, extended return rights) that affect whether revenue was recognized appropriately. The terms themselves must be examined.

Answer C. The auditor should base further work on whether the total body of evidence is still sufficient and appropriate in light of contradictory results. Contradictory cutoff exceptions can reduce the persuasiveness of earlier procedures (such as analytical procedures), and if the evidence no longer supports an acceptably low audit risk, additional procedures are required.

Why not A: Account size and materiality affect audit focus, but they do not override the need to resolve contradictory evidence. The immediate governing issue is whether the evidence is persuasive, not solely the account's relative size.

Why not B: Management's explanation may be plausible, but representations or explanations are not substitutes for auditor evidence. The auditor must independently evaluate contradictory evidence and obtain additional evidence if necessary rather than simply accept management's characterization.

Why not D: Favorable analytical results can provide support, but later detailed testing that reveals cutoff errors may be more persuasive and can undermine that comfort. Contradictory results require re-evaluating the total evidence.

Answer D. Negative confirmations depend on recipients' silence to imply agreement; when response rates are expected to be low, silence is not persuasive evidence and negative confirmations provide little assurance. Positive confirmations (with follow-up), examination of subsequent cash receipts, and inspection of shipping documents produce more direct evidence and are less affected by low external response rates.

Why not A: Tempting because confirmations are external evidence of balances; however positive confirmations require explicit replies and allow follow-up on nonresponses, so they generally provide more persuasive evidence than negative confirmations even when overall response rates are low.

Why not B: Tempting because shipping documents and invoices support occurrence of sales and related receivables, but these internal and third-party documents can be inspected regardless of customer reply behavior, so this procedure is less affected by low confirmation response rates.

Why not C: Tempting because matching cash receipts gives objective, verifiable evidence that receivables were collected, but this procedure does not rely on customer responses to confirmations and therefore is not limited by a low expected response rate.