Process Audit Guide & Checklists

What is a Process Audit?

A process audit examines whether a specific process is being followed correctly and is delivering its intended results. Unlike a system audit, which evaluates the entire management system against the requirements of a standard such as ISO 9001, a process audit focuses on a single process — from its inputs through to its outputs.

The goal is straightforward: verify that the process operates as documented, that the people involved understand their roles, that the correct resources are being used, and that the process is achieving its intended outcomes. Process audits are particularly effective at uncovering gaps between what the documentation says should happen and what actually happens on the ground.

Examples of processes commonly subjected to process audits include purchasing, production, design and development, customer complaint handling, calibration, warehousing, and delivery.

Process Audit vs System Audit vs Product Audit

Organisations often use three types of audit, each with a different focus. Understanding the distinction helps you choose the right approach for your objectives:

A system audit gives you the broadest view of your management system's health. A process audit dives deeper into how individual processes actually operate. A product audit checks whether the end result meets the defined specifications. Most organisations benefit from a combination of all three, scheduled at appropriate intervals throughout the year.

What is a Layered Process Audit (LPA)?

A layered process audit (LPA) is a structured auditing method in which multiple levels of management regularly verify that standardised processes are being followed on the shop floor or in operational areas. The term “layered” refers to the fact that audits are conducted by people at different levels within the organisation — not just the quality department.

LPAs are particularly popular in the automotive industry (where they are often required under IATF 16949) and in manufacturing environments where process discipline is critical to product quality and safety. However, the principles can be applied in any sector.

Each layer audits at a different frequency:

• Operators / Team Leaders — Daily checks on their own work area, verifying that standard work instructions are being followed
• Supervisors / Line Managers — Weekly audits across their area of responsibility, looking at process adherence and conditions
• Department Managers — Monthly audits that cover a broader scope and look at trends from lower-layer audits
• Plant Managers / Directors — Quarterly or monthly audits that focus on systemic issues and management support for the process

The power of the layered approach is that it creates a culture of process discipline. When operators know that their supervisor, manager, and director all audit the same processes regularly, there is a strong incentive to follow procedures consistently. LPAs also surface problems quickly because they are conducted frequently and at multiple levels.

How to Conduct a Process Audit

Whether you are performing a standalone process audit or a layered process audit, the fundamental steps are the same. Here is a practical, step-by-step approach:

1. Select the process to audit — Choose the process based on risk, importance, previous audit results, customer complaints, or schedule. High-risk and high-volume processes should be audited more frequently.
2. Identify process inputs, outputs, controls, and resources — Before you begin, understand the process boundaries. What triggers the process? What materials, information, or instructions feed into it? What controls are in place? What resources (people, equipment, environment) are required? What is the expected output?
3. Review the documented procedure — Read the current version of the procedure, work instruction, or process map. Note any specific requirements, acceptance criteria, or control points that need to be verified.
4. Observe the actual process in action — Go to where the work is done (the “gemba”) and watch the process being carried out in real time. This is the most important step — it reveals the reality of how work is actually performed.
5. Compare actual practice vs documented procedure — Note any differences between what the procedure says should happen and what you observe happening. Not all deviations are negative — sometimes operators have found better methods that should be captured in the documentation.
6. Interview process operators — Talk to the people who perform the process daily. Ask open-ended questions: “Can you walk me through what you do?” “What happens if something goes wrong?” “How do you know when the output is acceptable?”
7. Check process performance data and metrics — Review KPIs, reject rates, cycle times, customer feedback, and any other relevant data. Process audits should look beyond compliance to assess whether the process is actually effective.
8. Record findings and improvement opportunities — Document your observations, nonconformities, and any suggestions for improvement. Be specific and factual — state what you observed, what the requirement is, and what the gap is.

Process Audit Checklist

Use the following checklist as a starting point when conducting a process audit. Adapt it to suit the specific process and your organisation's requirements:

• Is the process documented and current? — Check that a procedure or work instruction exists, is the current revision, and is accessible to the people who need it
• Are operators trained and competent? — Verify that training records exist, that operators have been assessed as competent, and that they can demonstrate an understanding of the process requirements
• Are correct materials and equipment being used? — Confirm that specified materials, tools, and equipment are in use and that equipment is within calibration or maintenance dates
• Are process controls being followed? — Observe whether control points, inspections, and checks specified in the procedure are actually being carried out at the required frequencies
• Are records being maintained? — Check that required records (inspection results, batch records, sign-offs, test data) are being completed accurately and retained as specified
• Are process KPIs being monitored? — Verify that key performance indicators are being tracked, that targets are defined, and that action is taken when performance falls below target
• Are nonconformities being managed? — Confirm that when things go wrong, nonconformities are recorded, investigated, corrected, and subject to corrective action to prevent recurrence

Download Our Process Audit Templates

We have developed a set of practical templates to help you plan, conduct, and report on process audits within your organisation. These complement the guidance above and give you ready-to-use tools for your audit programme:

• Internal Audit Checklist— Includes process-specific checklists that you can customise for any process in your management system. Covers all the key areas from documentation and training through to performance monitoring and corrective action.
• Audit Templates— Complete set of audit planning and reporting templates, including process audit plans, layered process audit schedules, and finding report forms. Ready to download and adapt to your organisation.