Change-Control Procedures

Change control is the formal process for proposing, assessing and approving any change to a manufacturing process, raw material, formulation or specification once production is underway. Without it, a well-intentioned change made informally on either side can introduce quality or regulatory risk without anyone realising until it's too late. This guide explains how a workable change-control process operates.

What Triggers a Change Request

Change control applies to a wide range of potential changes: a shift in raw material supplier, a process parameter adjustment, new equipment, a formulation tweak, or a change to the agreed specification itself. Either the buyer or the manufacturer should be able to initiate a change request, since useful changes can originate from either side.

Impact and Risk Assessment

Before any change is approved, it should go through an assessment of its likely impact on product quality, safety and regulatory compliance. This step exists precisely because changes that look minor - a different equivalent raw material grade, a small process parameter adjustment - can sometimes have consequences that aren't obvious without deliberate review.

Approval Before Implementation

A proposed change should be reviewed and approved by both the manufacturer's quality function and, for anything material, the buyer, before it's implemented - not retrospectively documented after the fact. This is the core discipline that change control exists to enforce.

Verification After Implementation

Once a change is implemented, verify that it achieved the intended result without unexpected side effects, typically through a defined verification batch or testing period before the change is considered fully effective.

Documentation

Keep a record of every change request, its assessment, approval and verification, referenced against the relevant quality agreement and specification - see quality agreements and setting quality specifications. This record becomes important if a quality issue later needs to be traced back to a specific change.

The Change That Nobody Told You About

Change control exists because of a specific and common failure: a manufacturer changes a raw material grade, a supplier, or a process parameter in good faith, and the first you know is a batch that behaves differently. Nothing was done wrongly - the change simply was not visible to you.

A change control clause requires notification and, for significant changes, agreement before implementation. It is one of the shortest provisions in a quality agreement and one of the most valuable, precisely because it catches problems before they reach production rather than after.

Defining Scope Sensibly

Set the threshold thoughtfully. Requiring approval for every trivial change is unworkable and gets ignored, which is worse than having no process. The categories that genuinely warrant control are raw material grade or supplier changes, process parameter changes, equipment changes that could affect the product, packaging changes, and testing method changes.

Changes should also flow the other way. If you change your specification, packaging or a supplied raw material, the manufacturer needs to assess the effect - so change control is bilateral. Record changes in a way that lets a later problem be correlated with them, since an undocumented change is a common reason an investigation stalls. Some changes may also affect classification and labelling.

Questions to Ask a Manufacturer

• What is your standard change-control process, and can we see it documented?
• Do we get notified and given the chance to approve changes before they're implemented, or only after?
• What triggers a formal change-control review versus a routine adjustment?
• How do you verify a change achieved its intended result?

Frequently Asked Questions

Related Guides

• Quality agreements
• Setting quality specifications
• Reducing contract manufacturing risk