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Incoming quality control stage sheet

Incoming quality control stages describe how a purchased part is controlled, from no control at all to supplier self-control with no incoming check. The idea is to move inspection effort from your receiving dock to the supplier's own process, one stage at a time, as the supplier proves its process is under control. This sheet uses seven stages: no control; a 100% check at the line; a 100% check at receiving; the supplier checks 100% and you sample; the supplier controls the process and you sample; the supplier controls the process and you check paperwork; and supplier self-control with no incoming check. The register records each part's severity, the supplier's colour, its current and target stage, the highest stage its severity and colour allow, and the evidence needed to move up. The Excel version flags parts over their ceiling, counts parts by stage and estimates the receiving inspection hours saved. The stages are general quality practice, written in our own words.

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Page 1 of the incoming quality control stage sheetHeader fields above a part register with columns for part, supplier, severity, supplier colour, a current stage from 0 to 6, the highest stage allowed, target stage, target date and evidence needed.
Part registerSeven control stagesSeverity and supplier colourHighest stage allowedEvidence to move upInspection hours savedProgress summaryWorked example
Filled-in Incoming quality control stage sheet: 40 purchased parts, five moving up a stage
The same sheet filled in with the worked example (page 4 of the PDF, illustrative numbers). Open full size (opens the picture in a new tab)

When to use it

When to use the incoming quality control stage sheet

  • When your receiving inspectors check everything because there is no basis for trusting anything, and you want a way out of that.
  • When a supplier asks what it would take to stop being inspected at every delivery.
  • When you have to decide which purchased parts deserve attention first: the severe ones from suppliers with a poor record.
  • To show management how much inspection effort a supplier improvement programme could release.
  • Not for scoring a supplier's overall performance; use a supplier scorecard for that and a supplier audit for the process.

How to fill it in

  1. 1

    List the purchased parts

    Start with the parts that matter most or cost most to inspect. One line per part with its supplier.

  2. 2

    Class each part by severity

    Critical if a defect could hurt someone or break a requirement, major if it stops the part working or the product being built, minor if it does not affect function or assembly.

  3. 3

    Give each supplier a colour for that part

    Green for a good record with the process shown to be under control, amber for some problems or missing evidence, red for repeated problems or no evidence.

  4. 4

    Mark the current stage honestly

    Put each part at the stage it really has today. A certificate on file is not process control, so a part does not reach stage 4 or above without evidence that the supplier's process is in control.

  5. 5

    Check the ceiling, then set targets

    A part above the highest stage its severity and colour allow is trusting the supplier too much. For the rest, set a target stage and date and note the evidence needed to move up.

  6. 6

    Estimate the hours and review each quarter

    For parts moving up, enter lots a month and the receiving inspection hours a lot now and at the target. Review the colours and the stages every quarter, and move parts down where defects return.

A filled-in example

Illustrative, not a benchmark

An example (illustrative): 40 purchased parts from eight made-up suppliers, with 12 parts at stage 2, a 100% check at receiving.

  • Five of the stage 2 parts are major parts from green suppliers with good records. The plan is to ask each supplier for capability evidence and a clean run of lots, then move the part to stage 4 within a quarter.
  • Each of those parts takes 4 hours a lot to inspect now and about 1 hour after the move, at 4 lots a month.
  • Five parts times 3 hours saved times 4 lots is about 60 inspection hours a month.
  • Two parts are above the ceiling for their severity and supplier colour, one major part from a red supplier and one critical part from an amber supplier. They are planned back down to their ceiling until the suppliers improve.

The stage counts show the inspection moving from the dock to the suppliers, and the ceiling check shows where trust has run ahead of the evidence.

Common mistakes

  • Treating a certificate as control

    A quality certificate shows a system exists, not that this part's process is in control. Ask for capability data and a clean record before moving up.

  • Classing parts by cost instead of severity

    An expensive part is not always a severe one. Class by what a defect would do to the customer and the product.

  • One colour for the whole supplier

    A supplier can be good on one part and poor on another. Colour the supplier for each part, using that part's record.

  • Skipping stage 0

    Some parts have no control anywhere. Find them first: they are the ones where problems are found by chance.

  • Moving up without exit criteria

    Write down what evidence moves a part up, such as a run of clean lots and capability data. Without it, stages are opinions.

Download the template

Free to use: print it, copy it and edit it for your team. Enter your name and work email once to download.

Run this template in LeanSuite

In LeanSuite, when an inspector flags a defect the batch is quarantined and a SCAR with photos goes to Quality and Procurement, and the SCAR's lifecycle, including the days the supplier took to respond, feeds the supplier's scorecard.

See it in a 45-minute demo

FAQ

Incoming quality control stage sheet: common questions

  1. They are steps describing how a purchased part is controlled, from no control to supplier self-control with no incoming check. Each step up moves inspection effort from the customer's dock to the supplier's process, and needs evidence that the supplier's process is under control.

  2. Incoming inspection is the check you do at the dock. The stages describe the whole control of a part, including checks the supplier does, and give a route for reducing your own inspection as the supplier earns trust.

  3. When the evidence in the last column of the stage table exists, for example a run of clean lots, a control plan and capability data on the key characteristics, and clean audits. Write the evidence down for each stage so the decision is not an opinion.

  4. A ceiling for each severity and supplier colour. A critical part from a red supplier should not rely on the supplier's own control, so its ceiling is low. The ceilings here are a starting point to adjust to your own risk.

  5. Yes. If defects return, an audit finds a problem or the supplier's colour changes, move the part down and check more closely until the evidence is back. A move down is a finding, not a failure of the sheet.

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