Six Big Losses

Six Big Losses is the classic TPM loss categories covering downtime, speed, and quality-related productivity erosion - They provide a standardized framework for OEE loss analysis.

What Is Six Big Losses?

• Definition: the classic TPM loss categories covering downtime, speed, and quality-related productivity erosion.
• Core Mechanism: Losses are grouped into breakdowns, setup/adjustment, minor stops, speed loss, startup rejects, and production rejects.
• Operational Scope: It is applied in manufacturing-operations workflows to improve flow efficiency, waste reduction, and long-term performance outcomes.
• Failure Modes: Incomplete loss capture weakens prioritization and improvement focus.

Why Six Big Losses Matters

• Outcome Quality: Better methods improve decision reliability, efficiency, and measurable impact.
• Risk Management: Structured controls reduce instability, bias loops, and hidden failure modes.
• Operational Efficiency: Well-calibrated methods lower rework and accelerate learning cycles.
• Strategic Alignment: Clear metrics connect technical actions to business and sustainability goals.
• Scalable Deployment: Robust approaches transfer effectively across domains and operating conditions.

How It Is Used in Practice

• Method Selection: Choose approaches by bottleneck impact, implementation effort, and throughput gains.
• Calibration: Map every production event to one of the six categories with audit checks.
• Validation: Track throughput, WIP, cycle time, lead time, and objective metrics through recurring controlled evaluations.

Six Big Losses is a high-impact method for resilient manufacturing-operations execution - They anchor structured loss-elimination programs in manufacturing.