At Toyota, having engineers or managers stand inside a circle drawn with chalk for a long time is one of the most famous learning practices of TPS. Because this method was often applied by Taiichi Ohno, it is known as the “Ohno Circle”.
🎯 Core Purpose:
🟢 To see reality (Genchi Genbutsu)
🟢 To understand processes from the shop floor, not from a desk
🟢 To notice waste (muda), unevenness (mura), and overburden (muri)
🟢 To teach the difference between “looking” and “seeing”
Ohno’s perspective was this: “Don’t explain the problems. Stand in the circle and see for yourself.”
⏳ What Was Done Inside the Circle?
What is expected from the person standing in the circle:
🔶 To watch movements
🔶 To notice waiting times
🔶 To observe operator behaviors
🔶 To understand the material flow
🔶 To catch out-of-standard situations (abnormalities)
In the first few minutes, it usually looks like “nothing is happening.” But as time passes, the following begin to appear:
⚫ Micro-stoppages (micro-waits)
⚫ Unnecessary walking
⚫ Irregular rhythm
⚫ Recurring interruptions
⚫ Hidden bottlenecks
🤔 So why was this seemingly simple method so effective?
Because:
⚠️ The human mind tends to jump to quick solutions.
⚠️ Managers often fall into the trap of premature diagnosis.
⚠️ Real problems require patient observation.
This exercise forces the person into the following mode:
➡ No interpreting
➡ No generating solutions
➡ Only observation
👟 How Can You Apply It on the Shop Floor?
🟡 Select a critical station
🟡 Determine an invisible circle for yourself
🟡 Watch doing nothing for 20–30 minutes
🟡 Take notes, do not comment
🟡 Look for recurring abnormalities
On the first attempt, most people get bored. On the second attempt, the system starts to speak… It is worth trying. We must learn to see…
