QMS Process Interaction: How One Process Affects Another

Have you ever wondered why a problem in one department suddenly becomes everyone else's problem?

A customer changes an order. Purchasing has already ordered the materials. Production has started preparing the batch. The warehouse is working on the dispatch schedule. Now everyone must pause, examine the requirements and decide what needs to change. This example shows something about a Quality Management System (QMS). The work done by one department rarely stays inside that department. Sales, purchasing, manufacturing, quality, document control and management each have their duties. Actions are connected. Information matters. That is why understanding QMS process interaction matters.

What is QMS process interaction? #

In simple terms, process interaction is about understanding how different processes connect and depend on one another.

ISO 13485:2016, Clause 4.1, requires an organisation to determine the processes needed for its QMS and understand their sequence and interaction.

Think of it this way: one process receives information or materials, carries out its work, and passes an output to another process.

For example, purchasing provides materials for manufacturing. Manufacturing sends products for inspection. Quality activities provide evidence that requirements have been met before the product is released, as applicable. If one of these steps does not happen as planned, another process may be affected.

A process interaction map can help show these links.. The main goal is not to make a diagram that looks nice in the Quality Manual. It is to ensure that people know how work travels through the company.

Where do QMS processes interact? #

1. Sales and customer requirements #

It seems that it often starts with a customer enquiry or purchase order. The sales team must really understand the customer’s request, including product specifications, quantities, delivery dates and any contractual requirements that matter. Once the purchase order is accepted the needed information has to get to the teams that will fulfill the order.

Imagine a hospital orders bone plates with a particular configuration. If that requirement is not communicated correctly, production may prepare the wrong configuration, even if the manufacturing team follows its instructions properly.

The problem may have started during order review, but it can affect production, inspection, and delivery. That is why the handover between sales and other departments needs to be clear.

2. Purchasing and supplier management #

Purchasing relies on information about which materials or services are needed, when materials or services are required and which specifications must be followed. Supplier evaluation and supplier monitoring fit into this picture. A purchase order is one part of the process. The organisation also must know whether the purchased materials and purchased services meet the organisations requirements.

3. Manufacturing and quality control #

It believes Manufacturing relies on approved instructions, suitable equipment, available materials and trained personnel. I think Quality control activities help verify that the product meets specified requirements at the stages. Manufacturing and Quality need to share information.

Think that for example if an inspection identifies a nonconforming product the relevant people must be informed so the product can be identified and controlled. The organisation may also need to investigate why the problem occurred. I think that likewise a proposed manufacturing change may require review of work instructions, inspection arrangements, risks and validation requirements before implementation. Manufacturing and Quality have roles but their activities need to support the same outcome: consistently meeting requirements.

4. Document control and training #

Manufacturing relies on approved instructions, suitable equipment, available materials and trained personnel. I think Quality control activities help verify that the product meets specified requirements at the stages. Manufacturing and Quality need to share information.

Think that for example if an inspection identifies a nonconforming product the relevant people must be informed so the product can be identified and controlled. The organisation may also need to investigate why the problem occurred. I think that likewise a proposed manufacturing change may require review of work instructions, inspection arrangements, risks and validation requirements before implementation. Manufacturing and Quality have roles but their activities need to support the same outcome: consistently meeting requirements.

5. Internal audits, CAPA, and management review #

An internal audit may identify repeated gaps in supplier evaluation records. An investigation may reveal that responsibility for completing supplier reviews is unclear. Management can examine the information, consider whether resources or changes are needed and follow up on agreed actions. This connection matters because identifying a problem is the beginning. The organisation also needs to understand its cause, respond appropriately and determine whether the response has improved the process.

6. Risk management #

Consider what could go wrong at every stage. Risk management should not sit in a separate corner of the QMS, brought out only when an audit is approaching. Every process can have risks. In purchasing a risk is selecting a supplier that cannot consistently meet requirements. In document control a risk is the use of an obsolete procedure. During training a risk is employees being assigned tasks without the competence. In CAPA a risk is closing actions, without addressing the underlying cause. I see that these risks are different. The controls needed to address them will be different too.

For example if order changes are sometimes missed the organisation may insert a review and communication step. It should also verify whether the new arrangement really stops information from being lost. Risk management should be reexamined whenever audit findings, nonconformities complaints, changes or other relevant information suggest that current controls might not be enough. The key point is that risk management is relevant throughout the QMS not to the medical device itself.

A practical example #

One order, several connected processes

Imagine a medical device company receives an order for 20 bone plates.

Sales reviews the order. Purchasing gets the components that are needed. Manufacturing makes the plan for the work. Quality staff do the inspections as planned. When all the release requirements are met the warehouse gets the order ready to send out.

Now the customer requests a change to the order quantity.

Sales receives the updated request, but purchasing and manufacturing are not informed promptly. Production continues according to the earlier plan, and the warehouse starts preparing the original quantity.

The result? Unnecessary work, possible delays, and confusion about what should actually be delivered.

The company now needs to review its process interaction. Who is responsible for reviewing order changes? Which departments need to be informed? What records must be updated? How will the organisation confirm that everyone is working with the revised requirements?

It should also consider the risk of this happening again and whether the current controls are sufficient.

This is how process interaction and risk management work together. One helps the organization understand the links between parts. The other helps the organization see and manage the things that might go wrong at those links. Both are important, for keeping everything running smoothly.

How can an organisation improve process interaction? #

Start by looking at how work actually happens, not just how it is described in procedures.

• Map the processes: Show how activities connect and where information passes from one team to another.
• Define responsibilities: Make it clear who performs each activity, who approves it, and who needs to receive the output.
• Identify risks: Consider what could go wrong within each process and during handovers.
• Control changes: Ensure that relevant people are informed when changes affect their work.
• Review performance: Use audit findings, nonconformities, and other relevant information to identify weak points and check whether improvements work.

Outsourced processes should also be part of the organization’s thinking. When a third‑party company handles manufacturing, storage or any other task, outsourced processes still require responsibilities and proper controls to be put in place.

The process map should show the organization's operations. A company that makes its devices will not always have the same process interactions, as a company that sends manufacturing to others and handles distribution through outside companies.

Key takeaway #

A QMS is not a set of rules kept by different departments.

It is how those departments cooperate, share information, manage risks and react when something goes wrong. Often a manufacturing issue begins with purchasing. A delay in delivery starts with an order change that never got communicated. A repeated audit finding shows a flaw, in training or document control.

Examining each process separately is useful. Seeing how the processes link together gives the organisation a view of its QMS.

V Reg Solutions understands the importance of effective process interaction in building a reliable and compliant QMS. By supporting organisations with ISO 13485 implementation, QMS documentation, risk management, internal audits, and process improvement, V Reg Solutions helps medical device companies strengthen coordination between departments and improve the effectiveness of their quality management processes.

Ultimately, quality does not depend on one department doing everything perfectly. It depends on the entire system working together, with each process supporting the next.