Prevention costs is the proactive quality investments made to stop defects before they are created - these costs are intentional and usually produce the highest long-term return in manufacturing quality systems.

What Is Prevention costs?

• Definition: Spending on activities that reduce defect probability at design, process, and training stages.
• Typical Items: DFM reviews, PFMEA, process capability programs, training, and poka-yoke implementation.
• Timing: Occurred upstream before production fallout, warranty claims, or customer impact.
• Accounting Role: Classified as good quality cost that should displace failure-related cost over time.

Why Prevention costs Matters

• Highest ROI: Fixing root causes early is significantly cheaper than post-failure correction.
• Yield Stability: Prevention reduces variability and improves first-pass performance.
• Cycle-Time Benefit: Less rework and firefighting means smoother production flow.
• Customer Protection: Early controls reduce escape risk and field reliability incidents.
• Scalability: Strong prevention systems support faster and safer volume ramp.

How It Is Used in Practice

• Risk-Based Allocation: Prioritize prevention spend on failure modes with highest severity and frequency.
• Capability Build: Invest in training, standards, and control infrastructure before major launches.
• ROI Tracking: Measure downstream defect and COPQ reduction attributable to prevention actions.

Prevention costs are the most productive quality dollars an organization can spend - each unit of prevention investment reduces multiple units of downstream failure loss.