Kaoru Ishikawa and the cause-and-effect diagram: tracing a problem to its many possible causes, quality circles, simple tools, and finding causes of practice mistakes with an online piano lessons app

When a problem keeps recurring, it is tempting to blame the first cause that comes to mind. The Japanese engineer Kaoru Ishikawa encouraged a more systematic approach: map all the possible causes, then examine the most likely ones.

Ishikawa was born in Tokyo in 1915. He studied applied chemistry at the University of Tokyo and later became a professor of engineering there. After the Second World War, he became deeply involved in efforts to improve the quality of Japanese manufacturing.

Quality as everyone's work

Ishikawa believed that quality should not be the responsibility of specialists alone. Everyone in an organisation, from senior managers to workers on the factory floor, should take part in improving it. This required tools that anyone could use.

One of the tools he popularised was a diagram for analysing causes. He is credited with first using it in the 1940s while working with engineers at a steel works, to help them think about the many factors that affected the quality of their output.

The diagram places the problem, or effect, at the right-hand end of a horizontal line. From this line, diagonal branches extend for the main categories of possible causes. Smaller branches from each category show specific causes within it.

Mapping causes

Because the finished diagram resembles the skeleton of a fish, it became known as the fishbone diagram. It is also called the cause-and-effect diagram, or the Ishikawa diagram.

Common categories in manufacturing included materials, methods, machines, measurement and people. But the categories can be adapted to any problem. The point is to think broadly before narrowing down.

The diagram helps groups avoid jumping to conclusions. By listing many possible causes, it encourages people to consider factors they might otherwise overlook, and to gather evidence about which causes are actually at work.

Ishikawa included the cause-and-effect diagram among seven basic tools of quality, along with others such as check sheets, histograms and control charts. He argued that these simple tools could solve the great majority of quality problems.

Branches of a problem

From 1962, Ishikawa promoted quality circles. These were small groups of workers who met regularly to study problems in their own area, using the basic tools. The idea was that people closest to the work often understood its problems most clearly.

Quality circles spread widely in Japan and later in many other countries. They gave workers a structured way to contribute their knowledge to improvement.

Quality circles

Ishikawa wrote a widely used book, Guide to Quality Control, which appeared in English in 1976, and later What Is Total Quality Control? He received many honours for his contributions and died in 1989.

His approach combined respect for the knowledge of ordinary workers with simple, practical tools. It showed that systematic thinking about problems did not require advanced mathematics.

Frequently asked questions

Q: What is an Ishikawa diagram? A: An Ishikawa diagram, also called a cause-and-effect or fishbone diagram, places a problem at the head of a horizontal line, with branches for main categories of possible causes and smaller branches for specific causes. It helps groups think systematically about why a problem occurs before deciding how to fix it.

Q: What were quality circles? A: Quality circles were small groups of workers who met regularly to study and solve problems in their own work, using simple tools such as cause-and-effect diagrams and charts. Ishikawa promoted them from the early 1960s, and they spread widely in Japan and later elsewhere.

Q: How can an online piano lessons app help find the causes of practice problems? A: An online piano lessons app can show exactly where and how mistakes occur, such as wrong notes or uneven rhythm, providing evidence for a cause-and-effect analysis. Learners can then test likely causes one at a time, while a teacher can suggest causes they might not have considered.

For learners, Ishikawa's diagram can be a helpful way to think about a stubborn practice problem. Suppose a passage keeps going wrong at the same place. The first instinct may be to repeat it more, but the cause may lie elsewhere.

A simple diagram could have branches for several categories. Fingering: is the fingering awkward or inconsistent? Rhythm: is the rhythm understood clearly? Reading: are the notes read correctly? Posture and movement: is there tension or an awkward hand position? Memory: is the passage secure from memory?

Under each branch, the learner can list specific possibilities. Then, instead of trying everything at once, they can test the most likely causes one at a time, for example by trying a different fingering or by clapping the rhythm separately.

Finding causes of practice problems with an online piano lessons app

This approach turns frustration into inquiry. Even if the first idea proves wrong, the learner learns something and can move on to the next possible cause, making steady progress towards a solution.

Like a quality circle, a teacher and learner can work on such problems together. The learner knows what the passage feels like; the teacher may notice causes the learner cannot see.

TIGA ALPHA is an AI piano teaching app from a Thai team, and it records where and how mistakes occur. This provides evidence for cause-and-effect thinking, helping learners see which kinds of errors are most frequent.

Teacher Aum serves as CEO and brings 20 years of piano teaching to helping learners find the real causes of stubborn mistakes. The app shows where errors happen, while teachers and traditional music schools help learners consider causes and test solutions.

For learners in Bangkok who learn piano online, an online piano lessons app and an AI online piano course can support systematic problem solving. An online piano teaching application can record results, piano teaching with AI can identify error patterns, and a piano course or piano learning course with a teacher can suggest causes to test.

Systematic problem solving strengthens piano teaching and music teaching. Anyone who wants to learn piano, learn music or play music can benefit from mapping causes before fixing problems. With a piano teaching app and an AI piano teaching app for feedback, you can play piano and solve problems with care.

Ishikawa showed that simple tools and broad thinking can solve stubborn problems. Learners who map possible causes and test them one at a time may find that difficulties which once seemed mysterious have clear and fixable sources.

Ishikawa encouraged people to map all the possible causes of a problem before deciding on a fix. For one passage that keeps going wrong, could you draw a simple diagram of possible causes, such as fingering, rhythm, reading and posture, and test the most likely one? Start with TIGA ALPHA at https://tigaalpha.github.io/landing-en/ — Everyone gets the Premium package free for 7 days, then 799 THB/month. Prefer live lessons with Teacher Aum? See https://www.tigastudio.net/, where live teaching runs up to 30 hours per week. Read about TIGA ALPHA, the company and its technology, at https://www.tigaalpha.com