ISO 9001:2026 and Lean Six Sigma: Five Ways to Turn the New Standard into Measurable Improvements

The publication of ISO 9001:2026 marks a new stage in quality management.

The new edition maintains the process approach and the familiar structure, while placing greater emphasis on areas such as leadership, quality culture, ethical behaviour, and the management of risks and opportunities.

For many organisations, the first instinct will be to analyse the changes, update documentation, and prepare for the transition. All of this will be necessary, but there is a more important question:

How can we use the new standard to genuinely improve organisational performance?

This is where Lean Six Sigma can provide particular value. ISO 9001 provides the framework for the management system; Lean Six Sigma provides a structured methodology for turning its objectives into operational and financial results.

Here are five ways to connect the two.

1. Turn the process approach into a real view of flow

ISO 9001 promotes the management of activities as interrelated processes. However, documenting a process does not necessarily mean understanding how it actually works in practice.

Tools such as SIPOC, Value Stream Mapping, and process mapping help visualise:

• Customer needs.
• Process inputs and outputs.
• Handoffs between departments.
• Waiting times.
• Rework and decision points.
• Activities that do not add value.

The objective should not be to create a perfectly documented map, but to use it to discover where problems occur and which improvement opportunities have the greatest impact.

2. Turn risks and opportunities into prioritised projects

One of the areas strengthened in ISO 9001:2026 is greater clarity in the management of risks and opportunities.

Lean Six Sigma helps put this principle into practice through a project selection system based on criteria such as:

• Customer impact.
• Cost of poor quality.
• Potential reduction in lead times and errors.
• Technical feasibility.
• Data availability.
• Alignment with strategic objectives.

In this way, the risk register stops being a static document and becomes a source of concrete improvement projects, with clear owners, indicators, and expected benefits.

3. Translate the voice of the customer into measurable requirements

Customer satisfaction remains one of the pillars of ISO 9001. The challenge is to turn broad concepts — such as quality, speed, or reliability — into variables that can actually be managed.

Lean Six Sigma uses the Voice of the Customer and Critical to Quality characteristics, or CTQs, to translate those expectations into operational requirements.

For example:

• “Fast delivery” becomes a maximum delivery time.
• “Reliable service” becomes the percentage of deliveries completed in full and on time.
• “Simple process” can be measured by the number of steps, drop-offs, or required contacts.
• “Defect-free product” can be expressed through defect rates, complaints, or returns.

What is not translated into a measurable requirement is difficult to improve systematically.

4. Turn quality culture into daily behaviours

ISO 9001:2026 places greater emphasis on leadership, responsibility, and quality culture.

But culture does not change through a corporate statement. It changes when people adopt new working routines.

Lean Management provides practices such as:

• Short follow-up meetings.
• Improvement boards.
• Gemba Walks.
• Visual management.
• Structured problem escalation.
• Leader Standard Work.
• Root cause-based problem solving.

Senior management must sponsor the system, but it is the day-to-day behaviour of leaders and teams that determines whether continuous improvement becomes part of the culture or remains only in the manual.

5. Demonstrate that improvement produces sustainable results

Complying with the requirements of a standard and improving performance are related, but they are not exactly the same thing.

A DMAIC project makes it possible to demonstrate:

• What the initial performance level was.
• Which causes were driving the problem.
• Which solutions were implemented.
• What change was achieved.
• What financial or operational benefit was generated.
• How the process will be controlled to prevent the problem from recurring.

The Control phase is particularly important: an improvement is not complete when a solution is implemented, but when indicators, ownership, and mechanisms are in place to ensure that the results are sustained.

From conformity to performance

ISO 9001:2026 does not require organisations to use Lean Six Sigma. Nor does Lean Six Sigma replace a quality management system.

They are complementary approaches:

• ISO 9001 provides the management framework.
• Lean Six Sigma helps identify, execute, and control improvements.
• Data makes it possible to demonstrate the results.

The opportunity for organisations is not simply to adapt their documentation to a new edition of the standard. It is to use the transition as an opportunity to review processes, select the right problems to solve, and turn quality into measurable results.

What will be the main challenge for your organisation with ISO 9001:2026: updating the system, or ensuring that the system delivers better results?