A Reaction Plan defines exactly what to do when a process signal, defect, abnormal condition, or control limit breach occurs.
Definition
A Reaction Plan is a predefined response for abnormal process conditions. It tells operators, technicians, supervisors, or quality staff what action to take when a control limit is exceeded, a specification failure occurs, a machine alarm appears, or a process check is missed.
Reaction plans make control systems practical by connecting detection to containment, correction, escalation, and restart decisions.
History
Reaction plans developed with control plans, SPC, automotive quality systems, and Lean daily management. They address a common weakness: teams detect abnormality but do not respond consistently or quickly.
When to Use
Use Reaction Plans for control plan characteristics, SPC signals, mistake-proofing faults, inspection failures, safety-critical checks, customer-impacting defects, and equipment conditions that require immediate containment or escalation.
Step-by-Step
- Define the abnormal condition or trigger clearly.
- Specify immediate containment or stop criteria.
- Define who must respond and within what time.
- Describe troubleshooting, correction, and escalation steps.
- Define product disposition and documentation requirements.
- State restart approval requirements.
- Train affected roles and verify understanding.
- Audit reaction effectiveness and update after incidents.
Examples
- SPC: If a point is beyond the control limit, stop, contain product since last good check, notify supervisor, and investigate special cause.
- Assembly: If torque verification fails, quarantine affected units and verify tool calibration.
- Service: If customer data is missing, reject the transaction and return to the originator with a standard correction path.
Common Pitfalls
- Vague instructions such as notify quality.
- No containment boundary.
- No restart criteria.
- Untrained operators or supervisors.
- Reaction plan not linked to the control plan.
- No review after repeated triggers.