How to Conduct an SOP Audit: Step-by-Step Checklist to Review & Update Your SOPs

An SOP audit is a systematic check of whether your written procedures are still accurate and actually being followed, done by reviewing the document itself, watching the task performed, and interviewing the person doing it, then documenting and fixing whatever gaps turn up. 

Here’s a scene that plays out more often than most quality managers would like to admit: a technician checks each box on a monthly equipment inspection, signs off, done. Six months later, that equipment fails, and the review turns up something uncomfortable. The SOP said to check three things. The technician had only been checking two for over a year, and nobody caught it.

That’s the entire case for an SOP audit in one story. Having a written procedure and knowing it’s actually followed are two different things.

I’m walking you through the full process, using that same equipment inspection as the example along the way, so you see exactly how the steps play out rather than just what they mean in theory.

What Is an SOP Audit?

Audits come from two directions. An internal audit SOP effort is your own team checking its own work, on your own schedule, usually because something felt off or it’s just been a while. An external audit SOP situation is someone else’s timeline entirely: a regulator, a certifying body, a client’s due diligence team, and it doesn’t wait for you to be ready.

According to DSALTA’s 2025 compliance audit findings analysis, the average organization receives 8 to 12 findings during its first SOC 2, ISO 27001, or HIPAA audit, and outdated or incomplete documentation is consistently the most common trigger.

Either way, the goal is the same: find out whether what’s written matches what’s actually happening, before someone else finds the gap first.

How to Plan and Scope an SOP Audit?

Before anything gets reviewed, decide why you’re doing this and how far it reaches. Skip this step, and you either audit too little to catch the real problem, or too much to finish before anyone loses patience.

• Start With the Trigger
  There are three common ones: a scheduled or upcoming inspection, a recent change to tools or process that might have made an existing SOP wrong, or a pattern of errors that keeps tracing back to the same procedure. For our running example, the trigger is the third one, a piece of equipment failed, and the post-incident review pointed to the monthly inspection SOP as a possible cause.
• Define the Scope Precisely
  A useful scope names the specific SOP, the specific technicians or team, and the specific location, not just the department. For our HVAC example, that means auditing the monthly inspection procedure across the three technicians who currently perform it, not facilities maintenance as a whole. That level of precision tells you exactly when you’re done, and keeps the audit from quietly expanding into everything the department touches.
• Build the Right Team
  You need someone who knows the SOP cold and someone who’s never touched it, ideally a subject matter expert paired with the person who actually performs the task day-to-day. The SME checks whether the written steps are technically correct. The frontline employee tells you whether they’re realistic.

Use This Template

How to Review Existing SOPs Before the Audit?

Before anyone watches a process happen, start with the paperwork itself. A surprising number of audit findings come from this step alone, before a single observation takes place.

Build an SOP Inventory

Pull every version of the SOP you’re auditing, official and unofficial.

• Check with whoever manages the document library for the official, current version
• Physically walk the area where the task happens and look for laminated cards, sticky notes, or printouts near the equipment
• Confirm out loud with the person doing the task which version they actually reference, since it’s often not the one in the system

Check Version Control

Open the SOP and confirm it has the basics that prove it’s the authorized current version.

• Look for a version number, a revision date, and a signature or approval record
• Treat any missing element as a finding on its own; an unapproved or undated document can’t prove it’s current
• If two documents both claim to be current, check which has the more recent revision date and confirm with the document owner which one is actually authorized

Evaluate for Clarity and Completeness

Read the SOP top to bottom as if you’ve never seen the task before.

• For each step, check whether it names a specific action, not “check the system,” but “verify the pressure reading is between 40 and 60 PSI”
• Confirm that each step names a specific pass/fail threshold and a specific place to record the result
• Flag any step that fails one of these checks, since that’s exactly the vague language that produces inconsistent execution

A strong audit SOP example passes all three checks for every step, with nothing left for a reader to interpret.

How to Check Whether the SOP Is Actually Followed?

This is the step where the actual gap surfaces, not by rereading the document, but by watching what really happens against what’s written.

For the HVAC inspection, this is where it really plays out. Watching the technician work shows exactly what the post-incident review suspected: two checks completed, the third skipped entirely. The interview clarifies why: the third check requires a tool that went missing from the toolkit months ago, and nobody flagged it because the inspection still got signed off as complete either way. That’s not laziness or a training gap; it’s a written procedure that assumed a resource that quietly stopped being available, and a sign-off process that didn’t catch the difference.

How to Identify and Document Gaps?

Finding the gap and documenting it well enough to act on are two different skills. A vague finding gets argued with. A well-documented one doesn’t.

State the Deviation Precisely 

Write down what the SOP requires and what you actually observed, nothing more.

• Name the exact step number or title from the SOP, quoting what it requires
• Record what you actually observed instead, in plain, factual language
• Note how many times or over what period you observed it. One instance is an anomaly, six consecutive instances are a pattern
• Avoid summarizing or interpreting at this stage. Write what happened, not what you think it means

Back It With Evidence 

Attach something concrete to every finding so it can be independently verified later.

• Use a timestamped photo, a log entry, or a signed record that doesn’t match what should have happened
• If observing in person, note the date, time, and who was present
• If reviewing records, pull the actual document or screenshot rather than describing it from memory

Separate the Symptom From the Cause 

Once the deviation is documented, find out why it’s happening before writing any recommendation.

• Interview the person involved directly, don’t assume the reason
• Check whether it’s one person or everyone who performs the task
• Check whether it’s a new behavior, or has been happening since before the current SOP was written
• Match what you find to one of three usual root causes: a missing resource, an unrealistic time or staffing expectation, or a step that’s become genuinely impractical, since each needs a different fix

How to Report Findings and Update SOPs?

A finding that sits in someone’s notes doesn’t fix anything. This step turns the audit into an actual change, and the difference between a weak report and a strong one usually comes down to specificity.

Weak: “Technicians aren’t consistently completing all required inspection steps.”

Strong: “The HVAC inspection SOP requires a pressure check using a specific gauge as the third step. Across 6 reviewed logs, this step was signed off as complete, with no evidence that the gauge was used. Root cause: the required gauge has been missing from the toolkit for an unconfirmed period.”

The second version can’t be argued with, assigned an owner, or ignored. The first one can be all three.

• Compile the Audit Report

Every finding gets written to that same standard, then assembled into one document.

• List each finding as compliant, non-conforming, or needs improvement, not just pass/fail
• Attach the evidence directly to each finding, not as a separate appendix nobody opens
• Assign a named owner and a deadline to every corrective action
• Update the SOP Itself

Fix the language that actually caused the gap, not just the behavior around it.

• Replace vague instructions with a specific action, threshold, and place to record the result
• If the root cause was a missing resource, name that dependency directly in the rewritten step so it can’t quietly disappear again
• Keep the fix scoped to the step that failed; rewriting the whole document over one finding usually introduces new ambiguity elsewhere

The/Studio Technologies Inc. centralized its documentation into one resource its global teams could work from together, which reduced errors across the board. See how they did it.

Read the Full Case Study

How to Follow Up and Keep SOPs Current?

An audit that ends at the updated document isn’t finished. Plenty of corrective actions look good on paper, the week they’re written, then quietly stop happening once the pressure of the finding fades and nobody’s checking anymore. The real test of an audit isn’t whether the SOP got rewritten; it’s whether the rewritten version is still being followed three months later, and whether the next drift gets caught before it turns into another incident.

Set the first follow-up date before the audit is considered closed, not after. A corrective action with no scheduled check-in tends to quietly become permanent without anyone confirming it actually worked.

What Mistakes Undermine an SOP Audit?

Most audits don’t fail because the process was wrong. They fail because of a handful of habits that quietly undercut the whole exercise.

1. Treating the Audit as a Pass/Fail Inspection

An audit framed as “did you pass or fail” makes people defensive, and defensive people hide problems instead of surfacing them. Frame it as finding gaps to fix, not finding people to blame, or the next audit gets even less honest cooperation than this one did.

2. Auditing the Document Instead of the Behavior

Reading the SOP and confirming it looks complete isn’t the same as confirming anyone follows it. A beautifully written procedure that nobody’s watched in eighteen months tells you nothing about what’s actually happening on the floor.

3. Skipping the Interview Step

Observation alone shows you what’s happening, not why. Skipping the conversation with the person doing the task means you’ll fix the symptom and miss the missing tool, the unrealistic time expectation, or the outdated step causing it.

4. Writing Vague Findings

“Needs improvement” or “not fully compliant” gives nobody anything to act on. A finding that can’t be assigned, scheduled, or verified as fixed later isn’t a finding; it’s a comment.

5. No Follow-Up Date Set at Close

An audit that ends without a scheduled recheck relies on someone remembering to circle back on their own. That rarely happens, and the exact gap the audit just found has every chance of quietly reappearing.

Does the Platform You Keep SOPs In Actually Matter for an Audit?

A correction that goes back into the same shared drive as the outdated version risks the exact problem that caused the finding in the first place: someone working from the wrong copy without realizing it. This is solved by ProProfs Knowledge Base, the easiest customer support help center & internal employee knowledge base in one, through built-in version control that keeps one current version live and archives older revisions instead of leaving them as separate files scattered around.

The other recurring problem is auditing the document instead of the behavior. This is solved by AI Knowledge Brain, which draws on how the process actually gets used and flags when the written version stops matching reality, not just when someone remembers to check. AI Insights & Reports helps with the follow-up schedule too, flagging a procedure that hasn’t been reviewed in a while, before it becomes next year’s finding.

None of this replaces the interviews, observation, and documentation covered above. It just means the gap between document and practice gets caught sooner.

Start With One SOP, Not the Whole Library

Auditing every procedure at once is how most audits stall before they finish. Pick the one causing the most pain right now, the one behind a recent incident, a recurring complaint, or an upcoming inspection, and run the full six steps against it before touching anything else.

That single audit does two things at once: it fixes the immediate problem, and it gives you a working audit SOP template you can reuse on the next procedure, instead of relearning the process from scratch every time.

If the SOPs you’re auditing are still scattered across shared drives, printed binders, or a dozen slightly different file versions, that’s worth fixing before the next audit rather than during it. ProProfs Knowledge Base keeps one current version live per procedure, so the next audit starts with reviewing the document, not figuring out which copy is real.