When production has already started you need a short controlled path from request to decision. The goal is a visible record that lets you stop or continue work with known cost, time, and quality outcomes. Below is a practical method: immediate triage, a standard change request form, what to ask the supplier, how to compare responses, how to make the change legally binding in the purchase order, and follow-up steps to close the loop.

Immediate triage and who can stop the line

Begin by deciding whether production must stop now or can continue under containment. Ask three quick questions: does the change affect product safety or regulatory compliance, does it change fit, function, or core specifications, and does it jeopardize a committed ship date? If any answer is yes, consider an immediate hold until a confirmed plan exists.

Identify the decision authority before contacting the supplier. That can be a named buyer, product manager, or a cross-functional approver list. Record the triage decision with date, time, the person who authorized it, and the reason. This timestamped record prevents confusion about whether work should have continued and creates a starting point for supplier negotiations.

Create a controlled change request and required fields

Use a single Change Request document so every modification is tracked consistently. The request should be compact and cover essentials only. Assign a unique Change Request ID and a version number, reference the original PO line and batch, and state who requested the change.

Attach clear evidence and acceptance criteria. Include why the change is needed, the exact specification change, the requested effective date, allowable variance, and the acceptance criteria that the supplier must meet. Require supplier replies to include a revised lead time, itemized cost impact, impact on quantity and yield, and any new samples or tooling needs.

Include fields that make decisions simple. At minimum the form should ask for: requester name and date, PO number and line, short description of change, required before milestone, supplier impact estimate, sample requirement, proposed authorization route, and signatures for buyer and supplier. This compact record makes later reconciliation straightforward.

• Change Request ID and reference PO
• Short description of the change
• Required effective date and acceptance criteria
• Supplier itemized impact: costs, time, scrap, rework
• Sample or photo evidence requirement
• Decision deadline and authorized approvers

What to demand from the supplier and how to compare replies

Ask the supplier for a firm Change Response with detailed line items: material delta with unit pricing, added labor or machine time, tooling changes, scrap or rework estimates, revised lead time, and any effect on packing or labeling. Require a sample or current production photos when any dimension or finish changes.

Set a clear response deadline and require a single consolidated quote for each option the supplier can offer. Compare replies by creating a simple matrix that lists cost, time, sample need, and quality risk for each option. This side-by-side view makes tradeoffs visible and lets nontechnical stakeholders weigh implications easily.

Decide with a cost-time-quality tradeoff and approvals

Make the decision against preestablished thresholds. For example, small cost deltas may be handled by the buyer alone, moderate changes may need product manager approval, and large cost or schedule impacts should escalate to finance and operations. Document which threshold applies and who signed off.

When comparing options, calculate net cost impact including rework, scrap, possible customer compensation, and freight shifts. Also consider time sensitivity: a modest cost increase may be preferable to delaying an entire campaign. Record the chosen option, the rationale, and any conditional terms such as required inline inspections or sample approvals.

Make the change binding: update the purchase order and payment terms

Translate the agreed option into an explicit PO amendment. The amendment should reference the Change Request ID, attach the supplier quote, list revised quantities, unit prices, delivery dates, and any new milestones such as pre-shipment sample approval or inline inspection checkpoints. Both buyer and supplier should sign the amendment and exchange signed PDFs.

Clarify payment and liability for the change. If the supplier is charging for rework or scrap, note payment timing and any credits for undelivered or damaged goods. Add explicit hold points where shipment is blocked until the buyer signs off on a sample or inspection result. Keep the amended PO and all supporting documents together so accounting, logistics, and quality teams can act on the same record.

Require supplier acknowledgment. Do not accept a verbal or implied agreement. A signed amendment or a supplier-sent order confirmation that references the Change Request ID and lists the revised terms is the minimum proof needed to proceed with production changes.

Follow-up: inspections, credits, and closing the request

After the change is in effect, enforce the agreed inspection plan. That may include inline checks, a pre-shipment sample that must match the acceptance criteria, or a third-party inspection. Record inspection outcomes against the Change Request ID so any disputes point to a single source of truth.

Handle cost reconciliation and lessons learned. Record agreed credits or invoices that resulted from the change, update cost of goods records, and log the episode in your supplier performance file. Close the Change Request with a summary: what was changed, final cost and schedule impact, who authorized, inspection outcome, and recommended next steps. This closure both completes the administrative cycle and feeds future sourcing decisions.

Create and send a Change Request form referencing the PO with a 48-hour supplier response deadline and require a signed amendment for any approved change.