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Out-of-control action plan (OCAP) template

An out-of-control action plan, or OCAP, is a written reaction plan for a control chart. It says what the person at the machine does the moment a point or pattern breaks a control chart rule: check the measurement, contain the parts, find the cause, correct it, prove the process is back in control, and record what happened. This template has the seven-step decision flow with a header for the characteristic, the limits, the owner and who to call, a reaction table that sets out what each common signal usually means and what to do first, and an event log. The Excel version times how long each event stays open, counts signals by rule and by cause, and has a chart check that flags rule breaks in a column of readings. A signal means the process has changed; it does not by itself mean a part is out of specification, so the plan treats the two separately.

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Page 1 of the out-of-control action plan templateHeader fields for the characteristic, limits, owner and who to call, above a seven-step flow from signal to release, with yes and no branches for a wrong reading and a cause not found.
Seven-step decision flowHeader with limits and ownerReaction table for seven signalsEvent logHours to closeSummary by rule and causeChart check in ExcelWorked example
Filled-in Out-of-control action plan (OCAP) template: a shaft chart on a CNC lathe, rule 2 fired
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 an OCAP

  • When you run control charts and operators or inspectors need to know what to do when a point goes out, instead of calling the engineer every time.
  • When the same signal keeps coming back and nobody can say what was done the last time.
  • When you set up a new chart and want the reaction written down at the same time as the limits.
  • When an auditor or a customer asks how you react to out-of-control conditions.
  • Not for a chart with no limits yet; collect enough data to set them first.

How to fill it in

  1. 1

    Fill in the header for one chart

    Name the characteristic and the process, the chart type, the centre line and control limits, the specification limits, the owner, a backup and who to call. One plan per chart, kept where the chart is.

  2. 2

    Choose one rule set

    Pick the rules that mean a signal and write them in the header. Published sets use different run lengths, so choose one and use it on every chart.

  3. 3

    Check the measurement first

    When a rule fires, re-measure the part and check the gauge and the plotted value. A wrong reading is a measurement problem, not a process problem.

  4. 4

    Contain and diagnose

    Set aside the parts made since the last good point, or slow down, as the reaction table says. Then look at the usual suspects: tool, material, setup, machine, method, measurement, environment and people.

  5. 5

    Correct and verify

    Fix the cause that was found. Make and measure a few pieces and plot them. The event is closed when the points are back inside and no rule fires.

  6. 6

    Log it and review the log

    Write each event in the log with the rule, the cause, what was held and the time to close. Review the log monthly and raise a corrective action for any cause that repeats.

A filled-in example

Illustrative, not a benchmark

An example (illustrative): a shaft diameter chart on a CNC lathe, with limits at 24.988 and 25.012 mm.

  • Seven hourly means in a row land above the centre line at 25.000 mm, though every one is inside the control limits. That is the run rule firing.
  • The operator re-measures the last subgroup with a second gauge, gets the same reading and rules out a measurement problem.
  • Every reading is inside the specification, so the lathe keeps running with a check every 15 minutes and no parts are held.
  • The insert turns out to be 150 parts past its planned life. It is changed, and five pieces are measured and plotted.
  • The next subgroups are back around the centre line. The event is logged as tool wear and the tool life limit is lowered.

The signal was caught before any part went out of specification, and the log now shows how often tool wear is the cause.

Common mistakes

  • Reacting to every point

    Adjusting the process after each reading adds variation. Act only when a rule fires, and use the reaction table to decide what to do.

  • Skipping the measurement check

    A drifting gauge produces signals that look like process changes. Re-measure and check the gauge before you stop the line.

  • Stopping at containment

    Setting parts aside protects the customer today. Without a cause and a correction the same signal will return tomorrow.

  • No named owner or phone number

    A plan that says escalate without saying to whom is not a plan. Put a name and a way to reach them on the header, and a time after which to call.

  • Confusing out of control with out of specification

    Control limits come from the process; specification limits come from the drawing. A point can be out of control and inside the specification, and the other way round.

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FAQ

Out-of-control action plan (OCAP) template: common questions

  1. An out-of-control action plan (OCAP) is a written reaction plan for a control chart. It lists what to check, how to contain suspect parts, who to call and how to confirm the process is back in control when a point or pattern breaks a control chart rule.

  2. Out of control means the process has changed, shown by a point beyond a control limit or a pattern such as a run on one side of the centre line. Out of specification means a part is outside the drawing limits. A process can be out of control while every part is still in specification, and the plan handles the two differently.

  3. Published rule sets use 7, 8 or 9 points in a row. The exact number matters less than choosing one rule set and using it on every chart, so that everyone reacts in the same way.

  4. Check the measurement: re-measure the part and check the gauge and the plotted value. If the reading is right, contain the parts made since the last good point as the reaction table says, then look for the cause.

  5. A control plan describes how each characteristic of a process is controlled and measured. An OCAP is the reaction plan for one control chart: what to do when that chart gives a signal. A control plan often points to its OCAPs.

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