AC410 Unit 4 Internal Control Walkthrough Example

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One warranty claim for a failed drive motor, traced from a dealer's portal entry to a quarterly reserve estimate, is followed in this AC410 Unit 4 internal control walkthrough at a composite stair lift maker. Purdue Global AC 410, Auditing, asks BS in Accounting students to trace one cycle and mark where a stated control fails. At Hallcroft Lifts, claim W-24817 for $1,186 passes cleanly through submission, technical approval, credit and the monthly report. The key control, the controller's review of any assumption change above $25,000, carries her initials, yet she compared the cut in the claim rate with nothing. The walkthrough judges the control well designed but not operating, and states three consequences for the audit.

CourseAC410 Auditing
UnitUnit 4
Paper typeInternal control walkthrough
LengthAbout 580 words, 5 pages double-spaced
FormatAPA 7 student paper
SchoolPurdue University Global
ProgramBS in Accounting
UpdatedOctober 2026

Free sample paper for AC410 Unit 4

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Initialed but Not Performed: A Unit 4 Internal Control Walkthrough of a Stair Lift Maker's Warranty Cycle

[Student Name]

Purdue University Global

AC410: Auditing

Unit 4 Internal Control Walkthrough

[Instructor Name]

[Date]

Hallcroft Lifts, its dealer, staff and every figure are composite; the standards and textbook cited are real.

What this part is doingStating the transaction, the control and the finding in the lead shows the walkthrough's conclusion before its evidence.
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Transaction Selected

Claim W-24817, submitted September 9 by a dealer in Dayton for a drive motor that failed on a curved stair lift installed in March 2023. Claim value: $1,186, a replacement motor at cost and the dealer's labor credit.

Steps Followed

1. Dealer submission. Procedure: inspected the claim record in the warranty module. Spoke to: the claims coordinator. Result: serial number, install date and failure code entered by the dealer; the module checked that the unit was within five years.

2. Technical approval. Procedure: inspected the approval log and the photo of the failed motor. Spoke to: the technical services manager. Result: approved September 11; failure code matched the photo.

3. Parts and labor credit. Procedure: traced the replacement motor to a shipping record and the labor credit to the dealer's account. Result: motor shipped September 12; credit of $310 posted September 30.

4. Monthly claims report. Procedure: agreed the claim to the September report's detail. Result: included at $1,186; the report totaled 162 claims and $201,400.

5. Quarterly reserve estimate. Procedure: inspected the third-quarter reserve calculation and the controller's review. Spoke to: the controller and the operations vice president. Result: described below.

The Review Control

The stated control: the controller reviews any change to the reserve's assumptions that moves the reserve by more than $25,000, compares the new assumptions with the claims data, and initials the calculation. The third-quarter calculation lowered the expected claim rate from 2.9 percent to 2.1 percent of units in warranty, reducing the reserve by about $230,000. The controller's initials and the date appear on the summary page.

When asked what she compared the new rate with, the controller said the operations vice president had explained that the new drive motor launched in 2023 was failing less often, and she had accepted that. No claims analysis was attached to the calculation, and she could not produce one. The vice president provided a two-line email, not data.

Initials prove that a page was seen, not that a review took place; because the controller compared the new claim rate with nothing, the control did not operate, and the team cannot rely on it to reduce testing of the reserve.

What this part is doingThe highlighted sentence separates evidence of a signature from evidence of a control operating, the distinction the walkthrough exists to make.
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Design and Implementation

The control is suitably designed: a person independent of the estimate reviewing assumption changes against data would address the risk. It has been implemented in form but did not operate as designed for the change that mattered most this year. Understanding a control means confirming that it exists in practice, not only on paper (American Institute of Certified Public Accountants, 2021). A walkthrough combines inquiry, observation, inspection and reperformance to confirm the auditor's understanding of how a transaction is processed and whether controls have been implemented (Arens et al., 2020).

Effect on the Audit

1. Control risk for the warranty reserve is assessed at maximum.

2. The team will develop its own estimate of the claim rate from the claims data, including the April conversion.

3. The matter will be communicated to the owners as a significant deficiency in internal control, since a review that did not happen over a significant estimate is important enough to merit their attention (American Institute of Certified Public Accountants, 2023).

What this part is doingEnding with the three consequences links the walkthrough to the plan and to required communications.
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References

American Institute of Certified Public Accountants. (2021). Statement on Auditing Standards No. 145: Understanding the entity and its environment and assessing the risks of material misstatement. AICPA.

American Institute of Certified Public Accountants. (2023). AU-C section 265: Communicating internal control related matters identified in an audit. In AICPA professional standards. AICPA.

Arens, A. A., Elder, R. J., Beasley, M. S., & Hogan, C. E. (2020). Auditing and assurance services (17th ed.). Pearson.

The Purdue Global AC410 Unit 4 instructions

The fourth AC410 unit asks you to walk one transaction through a cycle and evaluate the controls along the way. Choose a single transaction and identify it precisely, with its number, date and amount. Follow each step in order, stating what you inspected, whom you spoke to and what you found. Quote the stated control you are evaluating, including its threshold and the evidence it is supposed to leave. Then test whether it actually operated, not merely whether it was signed. Separate design from implementation and say which one failed. End with the consequences: the control risk assessment, the change in substantive work and any matter to communicate to management or the owners. Cite the AICPA standards on risk assessment and on communicating control deficiencies, plus your textbook, in APA 7.

How the AC 410 Unit 4 example is put together

The sample identifies claim W-24817, a $1,186 drive motor failure submitted by a Dayton dealer. Five numbered steps trace it through the warranty module, the approval log and photo, the shipped motor and labor credit, the September claims report and finally the third-quarter reserve calculation. The review control is quoted with its $25,000 threshold. Inquiry reveals that the controller accepted the vice president's account of a better motor and attached no analysis, and the vice president produced only a two-line email. The highlighted sentence states that initials prove a page was seen, not that a review took place. A design and implementation section cites SAS 145 and Arens and colleagues. Three numbered effects close the walkthrough: control risk at maximum, an independent claim rate and a significant deficiency letter.

Reading the AC410 Unit 4 grading rubric

Walkthroughs in AC410 are marked for completeness of the trace, accuracy in describing the control and soundness of the conclusion. Every step should show the procedure performed and its result, so a reviewer could repeat it. The control under evaluation must be stated precisely before it is judged. The highest credit goes to work that tests whether a control operated, through inquiry and inspection of what the reviewer compared, rather than accepting a signature. Distinguishing a design deficiency from an operating failure is an explicit criterion. Consequences must follow logically: an unreliable control raises control risk and shifts work to substantive procedures. Recognizing when a deficiency must be communicated in writing shows command of the standards. A walkthrough organized step by step, with APA 7 citations to the AICPA standards, collects the remaining marks.

AC410 Unit 4 help: mistakes that cost points

Many walkthroughs describe the cycle in general terms without following one real transaction. Steps are listed without saying what evidence was examined. The control is described vaguely, so it cannot be tested. A signature or initials are accepted as proof that a review happened. Design and operation are blurred, or a failed control is called a design flaw when the written procedure was sound. The consequence section stops at noting the problem and never says how the audit changes. Communication to the owners is forgotten. Inquiry of one person is treated as enough. If your case traces purchasing, payroll or revenue, our writers can follow your transaction through it and judge the control your instructor named.

Get an AC410 Unit 4 example written to your instructions

Include the process description the Unit 4 case gives you, any control documentation it quotes, and the rubric. One transaction is traced procedure by procedure against those facts, the stated control tested and its consequence for the audit spelled out, within 24-48h. The first custom sample carries no fee. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.

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AC410 Unit 4 questions, answered

Is the failure a design deficiency or an operating one?

Operating. The written procedure would prevent an unsupported estimate change if it were followed, so its design is adequate; what failed is performance, a review reduced to initials. A design deficiency would mean the control could not prevent the problem even when followed. Graders often test this distinction, and the sample states which applies and why.

What if my case describes a different cycle?

The same structure applies to revenue, purchasing, payroll or inventory: one transaction, each step with its procedure and document, the stated control quoted, the result, and the consequence for the audit. Share the case and your rubric, and the walkthrough is built on that cycle instead. Where your case states a control that actually works, the memo says so and records the evidence.

Where can I find a free AC410 Unit 4 sample paper?

This page holds a complete AC410 Unit 4 internal control walkthrough of a composite stair lift maker's warranty cycle, with five traced steps, the review control, the design verdict, three consequences and APA 7 references.

How did the AC410 Unit 4 walkthrough show the review never happened?

The controller's initials were on the calculation, but when asked what she compared the new 2.1 percent claim rate with, she cited only the vice president's explanation and could produce no claims analysis.

Why is the AC410 Unit 4 finding a significant deficiency?

A review that did not operate over a significant estimate, one that cut the reserve by about $230,000, is important enough to merit the owners' attention, so it must be communicated to them in writing.