Review the sample in conditions close to its intended use. Check dimensions, materials, colours, printing, finishing, packaging and anything affecting performance or presentation.
Do not leave feedback scattered across messages. Prepare one list linking each point to a photograph, measurement or specific description, distinguishing required changes from optional comments. Ask whether a change affects cost, timing or product appearance.
Keep a clear version of approved specifications and design. Establish whether the sample represents production materials and methods or is only an appearance model.
After approval, document any new change before it is made. A clear record helps track what was agreed when reviewing production or inspection.