Three inspection points, and the failure each one catches
The sample stage settles direction rather than the item. It is where colour placement, decoration position and proportion, the tone of a photograph against a print, and the feel of a chosen closure are decided. A sample cannot confirm what a production run will do, because it is made under different conditions — a different batch of blanks, a single unit rather than a run, frequently a different operator. What it does is move the decision earlier, while changing it is still cheap. The failure it catches is the most expensive one in the category: a design that was never right. Money spent on a sample before production is the cheapest money available anywhere in this process, and money refused on a sample is not lost at all.
The pre-production stage is the one most often skipped, because it sits in a window that is inconvenient for everyone involved. Its purpose is to establish what the run itself is doing rather than what the specification says it should do: the production units photographed or sampled against the approved proof, the colour reference actually in use, the grade of blank actually drawn from stock. The failure it catches is silent drift — a grade substituted, a reference shifted, a placement moved slightly for a reason nobody wrote down. Each of those is invisible on the invoice and obvious on the goods, which is why it can only be caught here and nowhere later. This is also the last point at which a run can be stopped, which makes it the only stage where a finding still changes the outcome rather than merely documenting it.
The delivery stage is inspection at receipt against what was written: count against the packing list, decoration against the approved proof, substrate against the stated grade, colour against the named reference, packaging as specified, and units per size or recipient exactly as delivered. What it cannot do is catch anything that needed catching earlier, because by this point the money is spent and the run is finished. Its real purpose is to preserve the remedy rather than to prevent the problem. A discrepancy found at receiving can still be raised against the order, with the specification, the proof and the goods all in one place; the same discrepancy found at month end can only be raised as a credit request against an invoice, which is a slower and weaker position.
- Sample stage
- Direction: colour, placement, proportion, feel — confirms the design, not the production run
- Pre-production stage
- The run about to be produced: grade, colour reference, placement, packaging — the last point at which it can be stopped
- Delivery stage
- Count, decoration, substrate, colour, packaging against the written specification — preserves the remedy rather than preventing the problem
- Evidence retained
- Approved proof, written specification, colour reference, inspection note, photographs, packing list, delivery note
- Tolerance
- Stated per parameter before production; a tolerance nobody set in advance is a dispute waiting for a reason