Factory Digitalization_Ver03. _ “When Quality Data Lies – How Inadequate KPIs Create the Wrong Behavior in Manufacturing”

shigenoritanaka3
3月8日
読了時間: 2分

更新日：3月9日

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Mar 08, 2026

Hello everyone,

Today, I would like to share a case that I have seen in multiple factories, where data visualization was already in place — yet the data still did not make sense.

1. Many factories track defect rates

They visualized defect rates daily and believed the data was reliable.

2. But sometimes the data does not make sense

The same production batch showed completely different defect rates depending on who inspected it.

3. The real issue was not product quality — it was inspector variation

In one case, an expert inspector consistently reported 2%, while others reported 8% for the same batch.

This is something I have seen in multiple factories, not just one.

Why? Because ambiguous products were treated as “bad” by most inspectors. This comes from human psychology: No one wants to be responsible for releasing bad products to customers.

4. Inadequate KPIs created the wrong behavior

Inspection resources were limited, so inspectors were given a KPI:

“How many products did you inspect?”

As a result:

Speed was prioritized
Inspection quality was sacrificed
Defect data became unreliable

This is the irony of KPI‑driven behavior.

5. The real cost

Unnecessary scrap caused by incorrectly classifying good products as defective directly squeezes a factory’s profit margins.

But the impact goes beyond scrap cost.

When analysis and decisions are based on inaccurate inspection data, they can mislead management and drive the organization in the wrong direction, creating an even more serious long‑term cost

Key Message

Factory data does not only reflect machine operations. It reflects human behavior. People do not follow strategy. They follow KPIs.

If you are considering factory data visualization or struggling with persistent defect rates, feel free to reach out.

60-minute free initial consultation: info@metricjapan.com

We look forward to supporting your improvement journey.

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