Quality Audit Best Practices, Methods & Common Challenges

You can't be everywhere.

That is what makes quality auditing harder when a business operates across multiple locations, teams, suppliers, or production environments.

The standard may be the same, but execution is not always consistent. One location may follow the process exactly. Another may interpret it differently. A third may have the right procedure but poor records showing whether it was followed.

A good quality audit program helps answer a practical question:

Are our standards actually being followed, and what evidence do we have to support that?

For multi-location businesses, the answer requires more than an occasional inspection.

It requires a repeatable audit method.

What is a quality audit?

Answer Box: A quality audit is a systematic assessment of whether defined quality requirements, processes, and controls are being followed and are producing the intended results. It uses objective evidence to evaluate conformity, identify findings, and determine where corrective action or process improvement may be required.

A quality audit looks at the relationship between:

Requirement → Process → Evidence → Result

For example, a company may require every location to inspect refrigeration equipment every week.

The quality audit asks:

• Is the required inspection defined?
• Is the inspection being performed?
• Are records available?
• Does the recorded result match what was observed?
• Are failures addressed?
• Do the same problems keep appearing?

That makes quality auditing different from simply checking whether a product or location looks acceptable.

A quality audit evaluates the process used to produce and maintain the required result.

ISO 19011:2026 provides current international guidance for auditing management systems, including audit principles, audit-program management, evidence-based auditing, risk-based auditing, and conducting and reporting audits.

What are the benefits of a quality audit program?

Answer Box: A quality audit program helps organizations evaluate whether processes are being followed, identify nonconformities, detect recurring failures, support corrective action, and maintain evidence of how requirements are being managed. Across multiple locations, a structured program also helps management compare results and identify areas that require additional attention.

A quality audit program is useful when it leads to decisions.

For example, an audit may reveal:

Location A: one isolated failure.

Location B: repeated failures in the same process.

Locations C–G: the same failure appearing across the network.

Those findings do not deserve the same response.

The first may require local correction.

The second may require closer follow-up.

The third may indicate that the standard, training, equipment, or process needs to be reviewed.

This is one reason a good quality audit program should not be judged by the number of audits completed.

It should be judged by what the organization learns and does afterward.

For the broader role of quality control across distributed operations, see Why Quality Control Is Important for Multi-Location Businesses.

What are the main quality audit methods?

Answer Box: Common quality audit methods include process audits, product audits, system audits, internal audits, external audits, first-party audits, second-party audits, and third-party audits. The appropriate method depends on the audit objective, the process or product being assessed, the relationship between the auditor and audited organization, and the requirements being evaluated.

The method should follow the purpose of the audit.

Process audit

Examines whether a defined process is being followed and producing the expected result.

Example:

Is the outlet following the required food-storage process?

Product audit

Examines whether a product or output meets defined requirements.

Example:

Does the finished product meet the specified characteristics?

System audit

Examines a broader management system and its related processes.

Example:

Is the organization's quality management system being implemented as intended?

Internal audit

Performed by or on behalf of the organization to evaluate its own processes or management system.

External audit

Performed by an external party, such as a customer, certification body, regulator, or other independent organization, depending on the context.

ISO 19011:2026 provides guidance for management-system audits and distinguishes audit-program management from the conduct of individual audits. It also emphasizes evidence-based and risk-based approaches.

For the distinction between quality control and quality assurance, see Quality Control vs Quality Assurance: What's the Difference?.

What is the difference between an internal and external quality audit?

Answer Box: An internal quality audit is conducted by or for the organization to evaluate its own processes, controls, and management system. An external quality audit is performed by an outside party for a defined purpose, such as customer evaluation, certification, regulatory review, or independent assessment. The evidence requirements depend on the audit objective.

The difference is primarily who is conducting the audit and why.

Internal quality audit

The organization uses the audit to evaluate itself.

It may be used to:

• identify process gaps
• check internal requirements
• prepare for external audits
• assess corrective actions
• identify recurring failures

External quality audit

An outside party evaluates the organization.

Examples include:

• customer audits
• certification audits
• regulatory audits
• supplier assessments

Internal audits should not simply be rehearsals for external audits.

They are an opportunity to identify genuine gaps while the organization still has time to address them.

For a practical readiness process, see Pre-Audit Readiness: How to Prepare for an Audit.

What are first-party, second-party, and third-party audits?

Answer Box: First-party audits are conducted by or for an organization on its own management system or processes. Second-party audits are performed by one organization on another party, commonly a customer assessing a supplier. Third-party audits are conducted by an independent organization, such as a certification body, for a defined assessment purpose.

These three terms describe the relationship between the auditor and the organization being audited.

| Audit type | Typical relationship | Example | | ---------------- | -------------------------------------------------------------- | ---------------------- | | First-party | Organization audits itself | Internal quality audit | | Second-party | Customer or other interested organization audits another party | Supplier audit | | Third-party | Independent organization conducts the audit | Certification audit |

The terminology matters because independence, competence, scope, and purpose can differ between these situations.

A supplier audit, for example, may focus heavily on whether a vendor can consistently meet the customer's requirements.

A third-party certification audit may assess conformity against the applicable management-system standard and certification criteria.

How should you plan a quality audit?

Answer Box: Quality audit planning should define the audit objective, scope, criteria, locations or processes covered, timing, responsible auditors, required evidence, sampling approach, and reporting method. Good planning makes the audit focused enough to produce useful findings without spending time examining information that falls outside the audit's purpose.

Start with the question:

What are we trying to determine?

Then define the audit around it.

A practical audit plan should identify:

Objective

What should the audit establish?

Scope

What locations, processes, products, departments, or requirements are included?

Criteria

What requirements will the auditor assess?

Auditors

Who will conduct the audit, and what competence is required?

Timing

When will the audit take place?

Evidence

What records, observations, interviews, or other evidence will be needed?

Sampling

Which locations, transactions, records, or activities will be reviewed?

Reporting

How will findings and conclusions be documented?

ISO 19011:2026 specifically includes establishing audit-program objectives, evaluating audit-program risks and opportunities, establishing and implementing an audit program, monitoring it, and reviewing it for improvement.

How do you conduct a quality audit?

Answer Box: A quality audit generally involves initiating the audit, reviewing relevant information, conducting the planned audit activities, collecting objective evidence, evaluating evidence against audit criteria, documenting findings, reaching conclusions, and preparing the audit report. Follow-up may then be required to address and verify significant findings.

A practical audit flow is:

Plan → Prepare → Conduct → Record → Evaluate → Report → Follow up

During the audit, the auditor may use:

• document review
• interviews
• direct observation
• sampling
• measurements
• photographs
• system records
• previous audit results

The important principle is that conclusions should be based on objective evidence, not assumptions.

For example:

"The process is followed."

is a conclusion.

The auditor needs evidence that supports it.

That evidence might come from records, direct observation, interviews, or other appropriate sources.

The exact audit technique should reflect the audit objective and the requirements being assessed.

What makes good quality audit evidence?

Answer Box: Good quality audit evidence is relevant to the audit criteria, sufficiently reliable for the conclusion being drawn, and capable of supporting a finding or decision. Evidence can include documents, records, observations, measurements, interviews, photographs, system information, or other verifiable information appropriate to the audit scope.

A useful rule is:

Don't collect evidence just because you can. Collect evidence that helps answer the audit question.

Suppose the requirement is:

Employees must complete mandatory training before performing a defined task.

Useful evidence might include:

• training records
• completion dates
• employee records
• competency assessments
• direct observation where appropriate

A photograph alone may not demonstrate training completion.

Likewise, a signed form does not necessarily demonstrate that a process was actually followed.

The evidence needs to match the claim being evaluated.

For multi-location operations, evidence becomes especially useful when management cannot physically inspect every location.

See How to Do Quality Control Across Multiple Outlets (Without Being Everywhere) for a practical example of using evidence to support quality control.

How should you document quality audit findings?

Answer Box: Quality audit findings should clearly identify the requirement being assessed, the evidence examined, the condition observed, and the resulting conclusion. A well-documented finding allows another person to understand what was found without attending the original audit and provides enough context to determine what corrective action may be required.

A useful finding answers four questions:

What was required?

What was observed?

What evidence supports the observation?

Why does the observation matter?

For example:

Requirement: Temperature checks must be recorded during each required service period.

Observation: The required record was missing for two service periods.

Evidence: The location's temperature log was reviewed during the audit.

That is much stronger than:

"Temperature compliance is poor."

The second statement gives a conclusion without explaining its basis.

Clear findings make corrective actions easier to assign and review.

How do you create a quality audit sampling plan?

Answer Box: A quality audit sampling plan defines which locations, records, transactions, products, or processes will be selected for examination when reviewing the full population is impractical. The sample should reflect the audit objective and relevant risk, with the selection method and limitations documented so conclusions are not overstated.

Sampling is necessary when there are too many records or locations to examine individually.

Imagine a company has:

500 locations

100,000 transactions

or:

50,000 quality records

A practical audit may examine a selected sample.

But the sample should have a reason behind it.

Possible factors include:

• risk
• previous findings
• location performance
• process variation
• recent changes
• volume
• known problem areas
• required coverage

Avoid choosing only the easiest locations or records to review.

A sample should help the auditor gather evidence relevant to the audit objective.

Also be careful about what the sample can prove.

A sample finding does not automatically mean every item in the population has the same condition.

The audit conclusion should reflect the scope and limitations of the sampling method.

How often should quality audits be conducted?

Answer Box: There is no universal quality-audit frequency that applies to every business. Audit frequency should reflect the audit objective, applicable requirements, process risk, previous findings, organizational changes, location performance, and available audit resources. Some audits may be scheduled regularly while others are triggered by specific events or changes.

A common mistake is choosing an audit frequency simply because it is easy to schedule.

Instead ask:

Why does this process need to be audited this often?

Frequency may increase when:

• a location has repeated failures
• a process changes
• a new location opens
• a serious issue occurs
• supplier risk increases
• previous corrective actions fail
• requirements change

Frequency may be lower for stable processes with strong historical performance, provided that mandatory requirements are still met.

For multi-location businesses, this can lead to a more practical model:

Baseline audits + risk-based additional audits

That is more useful than treating every location as identical.

How long does a quality audit take?

Answer Box: Quality audit duration depends on the scope, number of processes or locations, audit criteria, sample size, number of auditors, evidence required, and complexity of the organization. There is no standard duration that applies to every quality audit, so the audit should be planned around the work required to meet its objective.

A small process audit may be relatively short.

A large multi-location quality program can require much more time.

Before estimating duration, define:

• number of locations
• number of processes
• audit criteria
• sample size
• number of auditors
• evidence requirements
• interviews required
• reporting requirements

For example, auditing one location against five straightforward requirements is fundamentally different from assessing 50 locations against several frameworks and processes.

Do not choose the duration first and then force the audit into that window.

Define the work required first.

Then estimate the resources and time needed to perform it properly.

What are the common quality audit challenges?

Answer Box: Common quality audit challenges include unclear criteria, inconsistent processes, incomplete records, weak evidence, limited auditor time, poor sampling, resistance from audited teams, repeated findings, and corrective actions that are not verified. Multi-location organizations also face the added challenge of maintaining comparable audit practices across locations.

The most common challenges are usually process problems rather than audit-tool problems.

Unclear requirements

Auditors and locations interpret the same standard differently.

Weak evidence

The organization cannot demonstrate that the required process happened.

Inconsistent execution

Locations follow the same standard differently.

Poor sampling

The sample does not provide enough useful information for the audit objective.

Repeated findings

The same issue keeps returning.

Weak follow-up

Findings are recorded but not properly addressed.

Limited audit capacity

There are more locations or processes than available auditors can reasonably cover.

These challenges become more serious as the network grows.

For a deeper look at quality control across distributed locations, see How to Do Quality Control Across Multiple Outlets (Without Being Everywhere).

How do you overcome common quality audit challenges?

Answer Box: Quality audit challenges can be reduced by defining clear criteria, training auditors, using consistent methods, collecting evidence appropriate to each requirement, improving sampling, documenting findings clearly, assigning corrective actions, and reviewing recurring failures. Multi-location teams should also compare audit practices across locations to identify where execution differs.

A practical improvement cycle is:

Define → Audit → Find → Act → Verify → Learn

Define

Make the requirement measurable enough to audit.

Audit

Use a consistent method.

Find

Document observations using objective evidence.

Act

Assign the appropriate corrective action.

Verify

Check whether the action addressed the finding.

Learn

Look for recurring failures across audits and locations.

That last step is often missed.

If the same failure appears repeatedly, simply creating another corrective action may not solve the problem.

The organization may need to examine:

• training
• equipment
• process design
• staffing
• instructions
• supplier performance
• management practices

A good quality audit program learns from repeated findings instead of treating every occurrence as a separate event.

How should corrective actions be handled after a quality audit?

Answer Box: Corrective actions should address identified findings through a defined owner, appropriate action, target date, status tracking, and verification of effectiveness where required. Closing an action should mean more than marking it complete; the organization should have enough evidence to determine whether the action addressed the identified problem.

A basic corrective-action workflow is:

Finding → Cause → Action → Owner → Deadline → Evidence → Verification

Not every finding needs the same response.

A minor issue may require a simple correction.

A recurring or significant issue may require investigation into why the failure keeps occurring.

The important part is distinguishing:

Correction

from:

Corrective action

A correction addresses the immediate problem.

Corrective action addresses the reason the problem occurred so that recurrence can be reduced.

For more detail, see How to Track Corrective Actions Across Multiple Locations.

Should quality audits be outsourced?

Answer Box: Quality audits can be performed internally, externally, or through a combination of both, depending on the audit objective, required independence, auditor competence, resources, and applicable requirements. Outsourcing may provide additional expertise or independence, but organizations should retain clear ownership of requirements, audit scope, findings, and follow-up.

Outsourcing is not automatically better.

It can make sense when:

• specialist expertise is required
• internal resources are limited
• greater independence is needed
• a customer or framework expects external assessment
• the organization wants an independent perspective

Internal auditing may make more sense when the organization needs frequent operational checks or deep familiarity with its own processes.

A practical model can combine both.

For example:

Internal audits throughout the year

plus:

Periodic independent external audits

The right balance depends on the purpose of the audit program.

How should a quality audit program work across multiple locations?

Answer Box: A multi-location quality audit program should establish common audit criteria and methods while allowing legitimate differences between locations. Central teams can define standards and reporting requirements, while auditors and local teams execute the relevant checks. Cross-location review then helps identify recurring failures, unusual results, and areas that need further investigation.

A useful structure is:

Central standards

↓

Location-specific requirements

↓

Scheduled audits

↓

Evidence

↓

Findings

↓

Corrective actions

↓

Cross-location review

The goal is consistency without pretending every location operates under identical conditions.

A retail store, restaurant, hotel, and manufacturing site may have very different quality requirements.

Even within one industry, locations can differ by:

• format
• equipment
• region
• staffing
• product mix
• risk

This is why the audit program should define what must remain consistent and what can legitimately vary.

For the broader operating model, see How multi-location businesses maintain standards as they scale.

How should quality audit software support the audit process?

Answer Box: Quality audit software can support the audit process by centralizing audit schedules, templates, field records, evidence, findings, corrective actions, and reports. Its value depends on whether those elements remain connected from planning through follow-up. The software should support the audit method rather than determine the organization's quality requirements.

The software should make the audit easier to manage.

It should not decide what quality means for you.

A useful system can help with:

• audit scheduling
• template management
• field execution
• evidence capture
• findings
• corrective actions
• reporting
• historical records

For a multi-location business, the key benefit is keeping the records connected.

For example:

Location → Audit → Finding → Corrective action → Resolution

That makes it easier to investigate what happened at a location without reconstructing the history from separate files.

Audiment is positioned around this kind of multi-location audit workflow.

For a comparison of quality-audit platforms, see Best Quality Audit Software for Multi-Location Businesses in 2026.

What should a quality audit checklist include?

Answer Box: A quality audit checklist should translate defined requirements into clear, assessable questions or checks. It should identify the process or requirement being tested, expected evidence, appropriate response methods, and any scoring or finding rules needed. A useful checklist is specific enough to produce comparable results without creating unnecessary questions.

A good checklist should make it difficult to misunderstand the requirement.

Instead of:

"Is quality acceptable?"

use a specific criterion such as:

"Are all sampled units within the approved specification?"

The right questions depend on the process.

A quality audit checklist may include:

• requirement or criterion
• audit question
• response type
• evidence requirement
• severity
• scoring
• notes
• finding rules
• corrective-action requirements

Avoid turning the checklist into a document containing every possible question.

Longer does not automatically mean better.

A checklist should contain the checks needed to answer the audit objective.

For a broader checklist-building approach, see the planned Quality Audit Templates, Checklists & Reports guide.

How should quality audit results be reviewed?

Answer Box: Quality audit results should be reviewed at both the individual audit level and the program level. Individual review checks whether findings and evidence are accurate. Program-level review examines patterns across locations, processes, auditors, time periods, and corrective actions to identify recurring failures or areas where the audit program itself may need adjustment.

A single audit tells you what happened during that audit.

A quality audit program should also help answer:

What keeps happening?

Review:

• repeat findings
• finding categories
• high-severity issues
• corrective-action aging
• location differences
• audit completion
• recurring process failures
• changes over time

Suppose the same requirement fails at 12 locations.

That may be more important than one location receiving a particularly low score.

The program-level view helps management decide whether the issue is local or widespread.

For deeper quality-control methods, see the planned Quality Control & Manufacturing Audit Methods guide.

What are the best practices for running a quality audit program?

Answer Box: Effective quality audit programs use clear criteria, competent auditors, appropriate sampling, objective evidence, consistent documentation, meaningful findings, accountable corrective actions, and regular review of recurring results. Multi-location organizations should also maintain comparable audit methods across sites while adjusting frequency or scope when risk, performance, or operating conditions differ.

The practical framework is:

1. Define clear criteria

Auditors need to know what they are evaluating.

2. Train auditors

The person conducting the audit should understand the process, requirements, evidence, and method.

3. Plan the audit

Set the scope, timing, sampling approach, and evidence requirements.

4. Collect objective evidence

Base conclusions on what can be supported.

5. Document findings clearly

Make the finding understandable to someone who was not present.

6. Assign corrective actions

Give important findings an owner and appropriate deadline.

7. Verify resolution

Determine whether the required action was actually completed and, where necessary, whether it was effective.

8. Review patterns

Look beyond one audit and examine recurring failures.

ISO 19011:2026 emphasizes evidence-based and risk-based approaches and provides guidance for managing audit programs, conducting audits, reporting results, and evaluating auditor competence.

For ISO-focused audit methodology, see the planned ISO 9001 Auditing & Audit Readiness guide.

How Audiment fits quality auditing for multi-location businesses

Answer Box: Audiment is an audit management system for multi-location businesses. Its positioning centers on helping teams run audits with proof, track findings through corrective actions, and review results across locations. For quality auditing, the relevant question is how the system supports the organization's defined standards, evidence requirements, field workflows, and follow-up process.

The core Audiment problem is simple:

You can't be everywhere.

A quality program across dozens of locations therefore needs a reliable way to connect the field record with what management needs to review.

That means:

Audit → Evidence → Finding → Corrective action → Resolution → Review

Audiment is designed around this kind of workflow for distributed operations.

The software does not define your quality standards.

Your organization defines them.

The system helps teams run the resulting audit process and keep the resulting records connected.

The bottom line

Answer Box: A strong quality audit program starts with clear criteria and ends with verified follow-up. The essential practices are objective evidence, appropriate sampling, clear findings, accountable corrective actions, competent auditors, and regular review of recurring results. For multi-location businesses, those practices must remain consistent while still reflecting genuine differences between locations.

A quality audit is not successful because an auditor completed a checklist.

It is successful when the organization can answer:

What standard were we checking?

What evidence did we examine?

What did we find?

What did we do about it?

Did the problem stay fixed?

For a multi-location business, there is one more question:

Is the same thing happening somewhere else?

That is where a quality audit program becomes more valuable than a collection of individual audits.

You can't be everywhere.

Your audit process therefore needs to make the information coming back from every location useful enough to decide where attention is needed next.

Related Audiment resources

Answer Box: These Audiment resources cover the surrounding quality and audit topics, including quality-audit software, quality control, operational auditing, risk management, multi-location execution, and the practical difference between quality control and quality assurance.

• Best Quality Audit Software for Multi-Location Businesses in 2026
• Quality Control vs Quality Assurance: What's the Difference?
• Why Quality Control Is Important for Multi-Location Businesses
• What Is Operational Auditing? A Plain-English Guide
• How to Do Quality Control Across Multiple Outlets (Without Being Everywhere)
• How to Run a Risk Management Audit Across Multiple Locations
• Quality Audit Templates, Checklists & Reports
• Quality Control & Manufacturing Audit Methods

Frequently Asked Questions

Answer Box: Quality audit questions usually cover audit methods, planning, evidence, sampling, findings, corrective actions, internal and external audits, audit frequency, auditor competence, outsourcing, and common challenges. The right approach depends on the audit objective, requirements, process risk, organization structure, and whether the audit covers one location or a distributed network.

What is a quality audit?

A quality audit is a systematic assessment of whether defined quality requirements, processes, and controls are being followed and supported by objective evidence.

What are the main types of quality audits?

Common types include process audits, product audits, system audits, internal audits, external audits, first-party audits, second-party audits, and third-party audits. The appropriate type depends on the purpose and relationship between the auditor and audited organization.

What is the difference between an internal and external quality audit?

An internal quality audit is conducted by or for the organization to evaluate its own processes or management system. An external audit is performed by an outside party for a defined purpose such as customer assessment, certification, or regulatory review.

How often should quality audits be conducted?

There is no universal frequency. Audit schedules should consider requirements, process risk, previous findings, location performance, organizational changes, and available resources. Higher-risk or underperforming areas may require additional attention.

How long does a quality audit take?

Audit duration depends on scope, criteria, sample size, number of locations or processes, evidence requirements, and available auditors. There is no standard duration that applies to every quality audit.

What makes quality audit evidence reliable?

Evidence should be relevant to the audit criterion and appropriate for supporting the conclusion being drawn. Depending on the audit, it can include records, observations, interviews, measurements, photographs, system information, or other verifiable information.

How should quality audit findings be documented?

A finding should identify the requirement, evidence examined, condition observed, and conclusion. Clear documentation allows another person to understand what was found and determine the appropriate follow-up.

What is a quality audit sampling plan?

A sampling plan defines which items, records, locations, transactions, or processes will be examined when reviewing the entire population is impractical. The sample should reflect the audit objective and relevant risk.

Should quality audits be outsourced?

They can be. Outsourcing may provide specialist expertise or greater independence, while internal audits may be more practical for frequent operational checks. The decision should follow the audit objective and organizational requirements.

How do quality audits work across multiple locations?

Multi-location quality audits use common criteria and methods while allowing legitimate differences between sites. Central teams define the standard, local teams execute the relevant checks, and management reviews results across locations for recurring failures and differences.

How does audit software support quality audits?

Audit software can organize schedules, templates, field records, evidence, findings, corrective actions, and reports. Its value depends on whether those parts remain connected throughout the audit workflow.

What is the difference between quality control and quality auditing?

Quality control focuses on controlling or checking the output and process against defined requirements. A quality audit evaluates whether the relevant processes, controls, and requirements are being followed and supported by appropriate evidence.

What are common quality audit challenges?

Common challenges include unclear criteria, inconsistent execution, weak evidence, incomplete records, poor sampling, limited audit resources, repeated findings, and corrective actions that are not properly followed through.