What is a control walkthrough?
Updated
A walkthrough is an audit procedure in which the reviewer traces a single transaction through a process from start to finish — following it through each step and control — to confirm that the process works the way it is documented and that the relevant controls are actually in place and understood. It answers the design question: is this control real and capable of working?
Walkthroughs are usually the first substantive step in evaluating a control. By personally observing one transaction move through the system, the reviewer verifies the process narrative against reality, identifies where controls sit, and confirms the people involved understand their responsibilities — before any conclusion is drawn about whether the control operates effectively over time.
How a walkthrough works
The reviewer selects one transaction and follows it through the entire process, at each step asking the people who perform the work to explain and show what they do, and inspecting the documents and system evidence the transaction generated. The goal is to confirm three things: that the process matches its documented narrative, that the identified controls exist and operate at the points claimed, and that the staff understand the control's purpose rather than performing it mechanically.
Because a walkthrough follows a single item, it is not a statistical test — one transaction cannot demonstrate that a control works consistently. Its purpose is confirmation of design and implementation: that the control is designed to prevent or detect a relevant misstatement, and that it has actually been placed in operation. Findings from a walkthrough often reshape the process documentation itself when reality differs from what was written.
Walkthrough versus tests of operating effectiveness
A walkthrough and a test of operating effectiveness answer different questions and come in sequence. The walkthrough establishes that a control is well designed and in place — the design and implementation question. Only once that is confirmed does it make sense to test operating effectiveness: selecting a sample of transactions over the period and checking that the control operated consistently each time.
Getting the order right matters. Testing the operation of a control that is poorly designed wastes effort — even flawless operation of the wrong control provides no assurance. So the walkthrough acts as a gate: confirm the control is designed to address the risk and actually implemented, then invest in sampling to prove it ran reliably throughout the reporting period.
Frequently asked questions
What is a walkthrough in an audit?
A walkthrough traces a single transaction through a process end-to-end, with the reviewer observing each step and control, to confirm the process matches its documentation and the controls are in place and understood. It verifies a control's design and implementation before any testing of how effectively it operates over time.
What is the difference between a walkthrough and a test of controls?
A walkthrough follows one transaction to confirm a control is well designed and actually in place — the design question. A test of operating effectiveness samples many transactions over the period to confirm the control operated consistently. The walkthrough comes first and gates the testing, since testing a poorly designed control provides no assurance.
Does a walkthrough prove a control works?
No. Because it follows a single transaction, a walkthrough cannot demonstrate consistent operation — that requires sampling over the period. Its role is to confirm design and implementation: that the control addresses a relevant risk and has been placed in operation, so that testing operating effectiveness is worth doing.
Published by ShipReady Metrics, an evidence-based technology and compliance intelligence platform. This guide is educational and vendor-neutral.