Jidoka: A Fundamental Method of Lean Manufacturing

Improving Product Quality by Detecting Anomalies in the Production Process

What Is Jidoka?

Jidoka is a Lean Manufacturing method whereby machines stop automatically when they detect an anomaly. The Japanese term “Jidoka” originated in Toyota’s production systems and can be translated as “automation with a human touch” or “autonomous automation”. You will also frequently hear the term “autonomation”, a portmanteau of “autonomous” and “automation”.

Historical note: The “Jidoka” method was born when Toyota’s founder developed a mechanism in 1896 capable of detecting broken threads in a loom and automatically preventing the machine from producing defective materials. The term Jidoka has since evolved and now sometimes encompasses the partial automation of machinery.

This principle now delivers considerable productivity gains, given that a single operator can oversee several machines simultaneously. It also prevents defects from recurring, reduces the risk of injury, and minimises material damage.

The 5 Principles of Jidoka

The Jidoka method is applied by following 5 principles: detect, alert, secure, analyse, and improve. Let us examine each of these 5 principles in turn:

• Detect: Components along the production line are equipped to detect anomalies such as production defects, raw material errors, or machine breakdowns. An alert system is also installed to notify operators when a malfunction is detected.

• Alert: If a machine detects an anomaly, it must be able to stop or slow down automatically, without operator intervention.

• Secure: Should a production stoppage occur, operators must be in a position to take appropriate measures to restore production. Relevant corrective actions are then put in place.

• Analyse: Managers must then retrospectively analyse the causes of the production stoppage in order to apply permanent solutions and prevent further stoppages from occurring.

• Improve: If the problem persists, a designated team must conduct an investigation to address the root cause of the anomaly.

Implementing Jidoka within a company takes place in 4 stages. Throughout this process, the human must remain at the heart of the approach and of the human–machine relationship, ensuring optimal collaboration.

Demonstrate management commitment

For operators to successfully manage manufacturing processes, managers must place the same level of importance on Jidoka as on Just-in-Time (JIT) production.

Carry out readiness assessments

Implementing Jidoka involves a preparation phase during which managers must assess the organisation's level of readiness, together with all stakeholders affected by the transition. This makes it possible to adopt measures that will facilitate the change.

Run practical applications

Once managers consider the preparation phase complete, it is time to launch practical applications — in particular to verify that alert systems are functioning correctly and that teams are properly trained.

Apply the 5 principles of Jidoka

The next step is to begin applying the 5 principles of Jidoka, in order to guarantee quality, eliminate the 7 types of waste identified by Lean Manufacturing — including stock reduction — and improve working conditions.

What is the difference between the Jidoka and Poka-Yoke methods?

When discussing the Lean method of Jidoka, Poka-Yoke is frequently mentioned. However, the two methods should not be confused. Poka-Yoke is an error-prevention system. It therefore intervenes before an anomaly occurs, in contrast to the Jidoka method, which comes into play once an error has already happened. The two tools are therefore complementary.

The challenges of Jidoka in the Industry 4.0 era

Jidoka is a technological and organisational innovation that transforms workflows. It is one of the most important methods in Lean Manufacturing, enabling a continuous-improvement approach by drawing lessons from production defects and applying immediate solutions.