How Many Units Should Be Ready for an IPI?

For a UTS Initial Production Inspection (IPI), plan around 5%–10% of the order being finished, with enough available units of each SKU to complete the agreed inspection and tests. For 10,000 units, that production stage means 500–1,000 finished units; for 1,000, it means 50–100. These are readiness ranges, not sample sizes. If the agreed checks need more units, confirm a later date or a different scope with our team.

Our IPI service uses this early-production planning range. The required quantity depends on the defined inspection lot, sample allocation and product-specific tests. A factory reaching 5% completion does not automatically make the visit ready.

Convert the Production Stage Into Units

Multiply the order quantity by 0.05 and 0.10 to find the planning range. The table shows arithmetic only; it does not prescribe an AQL sample or a minimum inspection quantity.

For small orders, the range may contain too few units for the planned checks. For mixed orders, the total may hide an unfinished model, colour or size. Check the available quantity against the inspection plan before fixing the visit date.

Calculate the Quantity Needed for the Checks

Start with the agreed main sample. Then identify any additional units needed for tests that cannot share that sample, laboratory submission or retention. Agree any further reserve separately. Do not add every test quantity together if the same units can legitimately undergo several checks.

For a hypothetical 1,000-unit order, suppose the agreed plan calls for 80 units for the main checks and six separate units for destructive testing. With no overlap, at least 86 finished units are needed before any additional reserve. At 5% completion, only 50 exist: 36 short. At 10%, 100 exist: 14 above that requirement. The 80 and six are assumed planning inputs, not standard-table lookups or a UTS default.

Where acceptance sampling is specified, a single-sampling plan includes a sample size and an acceptance number; the sample quantity alone does not define the plan. [1]

Confirm the applicable sampling standard and edition, lot size, inspection level, inspection severity, AQL values and defect-counting rules with our team. Use the approved plan to obtain the actual sample and acceptance/rejection numbers. Do not choose a smaller sample merely because fewer units happen to be ready.

Define What the Sample Covers

Acceptance sampling draws a random sample from an identified lot to support a decision about that lot; it is not intended to estimate the lot's quality. [2]

At an IPI, units not yet produced cannot be sampled. Our findings concern the goods, materials and production conditions actually checked. Even if the buyer uses the full order quantity as a planning reference for the sample size, the early inspection does not establish conformity of future output.

Identify the available batch, SKUs, production dates and relevant material or line differences. If the agreed scope changes to a smaller early-output lot, confirm its sampling requirements before selection and record the coverage limit. Changing the lot is not permission to present an incomplete inspection as a full-order result.

Count Finished Units by SKU

For multi-SKU inspections, our team reviews the SKU list, approved specifications, samples, packaging artwork, barcode data and buyer instructions. The available total must also support the agreed allocation across variants.

Suppose a 10,000-unit order contains four SKUs of 2,500 each. The factory has 500 finished units: 440 of SKU A and 20 each of B, C and D. If an illustrative plan requires 50 units from each SKU, B, C and D are each 30 short. Having 5% of the whole order finished does not resolve those shortages. This allocation is hypothetical, not a universal equal-sampling rule.

Agree whether variants belong in a combined lot or separate lots, and specify their test coverage. Extra units of one SKU cannot substitute for a missing SKU with different components, ratings or functions.

What Counts as Ready?

For finished-product checks, count units that have completed the operations needed for those checks, including curing, finishing and final assembly where applicable. Components and partly assembled goods may support a materials or process check, but they do not count as finished units for a complete-product function test.

• Keep the identified goods at the inspection location and accessible for random selection, rather than presenting only a pre-picked stack.
• Provide quantities by SKU and batch, with finished, unfinished and packed goods distinguished.
• Have the approved sample, current drawings, specification limits and applicable test instructions available.
• Prepare the equipment, power supply and fixtures required for the agreed tests.
• Make the relevant packaging and labels available when those checks are included; unpacked goods cannot demonstrate finished carton marks.

When barcode or QR scanning is included, we require a 100% scan-success rate for the codes checked, using the agreed device and test conditions. Decoded data must match the approved SKU or label data. This requirement concerns the checked objects; it does not mean the whole order was scanned or guarantee compatibility with every downstream scanner.

How We Prepare the IPI

As described in our IPI booking guidance, we review the purchase order, specifications, approved sample and quality requirements to prepare a product-specific checklist. During the visit, we also review the production schedule and first-batch samples.

Our published multi-SKU guidance separates the workmanship sample from quantities for function, measurement, packaging and other product-specific tests. For your readiness check, list each required test beside its SKU, quantity and equipment needs. Confirm which units can be reused and which must remain separate. A total finished-unit count alone cannot show whether every test can be completed.

Before the visit, send our team a dated update showing finished quantities by SKU, expected quantities on the inspection date, missing components and equipment availability. Identify any laboratory samples separately; an IPI appointment does not mean laboratory testing is complete.

If Too Few Units Are Ready

Discuss the shortage with our team before the appointment. Depending on the inspection objective, the buyer can arrange a later date, agree a limited materials or first-off check, or approve a narrower lot and revised scope. A limited visit cannot establish results for checks that were not performed.

Do not replace defective selected units with good ones to obtain a favourable result. Extra test units must follow the agreed selection and testing instructions; they are not replacements that erase findings from the original sample.

What Our Report Records

Our report presents actual findings only: the scope checked, available quantities and their verification basis, samples examined, measurements, test results, observed defects and limitations. Factory-reported quantities must be distinguished from quantities physically verified. Missing SKUs, unavailable equipment and unperformed checks are recorded as applicable, not treated as passed.

We do not include corrective-action recommendations, improvement plans or release advice in the report. The preparation options in this article are general guidance, separate from report contents. Decisions about changes to production or shipment remain with the buyer and supplier. An IPI report is not a product certificate or a substitute for required laboratory testing.

Sources

1. NIST/SEMATECH e-Handbook — Types of Lot Acceptance Sampling Plans
2. NIST/SEMATECH e-Handbook — What Is Acceptance Sampling?