The Six Big Losses: Where Your Capacity Actually Went

Every plant believes it knows where its capacity goes. Almost every plant is wrong, because the biggest thief rarely announces itself. TPM organizes the theft into the Six Big Losses — a taxonomy worth memorizing, because what gets named gets hunted.

Two losses attack availability. Equipment failures — breakdowns — are the visible villain: the stopped line, the scrambled technicians, the lost shift. Setup and adjustment losses are subtler: every changeover is planned downtime, and a changeover that takes forty minutes when the method allows fifteen is a loss the schedule has learned to call normal.

Two losses attack performance, and these are the masters of disguise. Idling and minor stops are the micro-jams, sensor flickers, quick resets, and short pauses — each too small to feel worth recording, which is precisely how they drain capacity quietly all day. Reduced speed is the machine running below its designed rate because somewhere, sometime, someone slowed it to mask a problem nobody ever returned to solve — drift, normalized into a setting.

Two losses attack quality. Process defects consume material, time, and trust in rework and scrap. Startup and yield losses are the defective production every run generates before the process stabilizes — a tax paid at every changeover, multiplied by however many changeovers the schedule demands.

The taxonomy earns its keep in two ways. First, it forces honesty about proportions: plants that finally measure all six routinely discover that their dramatic breakdowns cost less than their undramatic minor stops — the deaths by a thousand small cuts. Second, it routes the response: each loss category maps to specific capabilities, which means the Six Big Losses are also a training syllabus in disguise. The plant that knows where its capacity went knows exactly what its people need to learn next.

Adapted from TPM Education and Training: Total Productive Maintenance (2026 Expanded Edition) by Dr. Gene A. Constant, founder of Global Sovereign University. Explore the trades library — and talk to GENO, a robot you can actually TALK to — at globalsovereignuniversity.org.