When a supplier proposes a product change after a quotation, you must capture the facts that affect cost, timing, and risk before you approve. The record you create will shape negotiations, sample decisions, production flow, and quality checks. This article gives a stepwise checklist so each change can be compared, quantified, and approved with a visible decision trail.

1. Write a single change summary and show the before and after

Begin with a concise, one-sentence summary that names the change and its reason. For example, note whether the supplier changed a material, tooling detail, component supplier, color formula, or packaging layout. Record who proposed the change and why it was proposed, such as cost saving, material shortage, or compliance clarification.

Follow the summary with a side-by-side comparison of the original spec and the new spec. Use measurable fields: exact material grade, dimensions with tolerances, weight, component part numbers, color references, and packaging measurements. Do not rely on vague terms like similar or upgraded. The comparison must make it possible to check a sample against both sets of expectations.

2. Link the change to the quotation’s price and provide a breakdown

Record how the change affects the quoted unit price and total order value. Ask the supplier for a clear delta: show original unit cost, new unit cost, and the precise line-item reason for the difference. If the supplier cannot break down the change into material, labor, tooling, or other cost lines, request that breakdown before you sign off.

Capture any one-time costs tied to the change such as new tooling, qualification runs, or drawing updates. Note whether those one-time costs are amortized across the current order or carried forward to future orders. If you expect multiple orders, record the assumed amortization period used to compute the per-unit impact.

• Original unit price
• New unit price
• Unit delta and percent change
• One-time costs and amortization assumptions

3. Record MOQ, batch planning, and inventory effects

A product change can alter minimum order quantity or force a different production batching plan. Document whether the MOQ changes for the finished product or for any new subcomponents. If the change makes small-batch runs impossible, record the new minimum run size and the inventory implications.

Note how the change affects reorder cadence and storage needs. If the supplier needs to group multiple buyers to hit a MOQ, record whether that approach will mix batches, change labeling options, or create lead-time dependencies on other clients. Include any commitments the supplier makes about segregating your stock or delivering partial shipments.

4. Capture lead-time and schedule shifts, including milestones

Document the revised lead time from order confirmation to shipment. Break lead time into measurable milestones: sample approval, tooling completion, pilot run, production start, inspection windows, packing, and expected ship date. If the supplier gives ranges, record the best case and worst case and the criteria that would move the date between those bounds.

Record any changes to priority or capacity allocation. If your order is now deprioritized or moved to a later production slot because of the change, note the supplier contact who confirmed the allocation and any compensating actions the supplier offered, such as split shipments or expedited runs at extra cost.

5. Define sample, testing, and approval requirements

Before approving the change, decide whether a new sample or rework of the existing sample is required. Record the exact sample type you expect: pre-production sample, first article, production sample, or a lab-tested batch. Specify who pays for the sample, the timeline for delivery, and the acceptance criteria you will use.

If tests are necessary, list which tests, the standard or method, acceptance thresholds, and an agreed lab or inspection agency if applicable. State whether passing a sample will lock in the change or whether on-line inspection of the first production run is also required. Include a plan for what happens if the sample fails.

• Sample type and who pays
• Acceptance criteria and test methods
• Contingency if sample fails

6. Specify quality acceptance criteria, inspections, and sign-offs

Translate the change into clear, testable quality requirements. Record dimension limits, acceptable defect rates, functional performance thresholds, or visual standards. If the change introduces a new material or supplier, add any supplier qualification evidence you need, such as material certificates, test reports, or incoming inspection steps.

Finally, record sign-off and version control. Name the supplier contact who confirms the change and the buyer approver, with date and time. Assign a version number to the updated spec and store the prior version. Note who has authority to approve expedited fixes, and whether final production release requires a sample approval, a factory inspection, or written confirmation from both parties.

Create the single-page change record and attach the revised spec to the quotation.