Ishikawa’s Basic Tools of Quality
Quality pros have many names for these seven basic tools of quality, first emphasized by Kaoru Ishikawa, a professor of engineering at Tokyo University and the father of “quality circles.” Start your quality journey by mastering these tools, and you'll have a name for them too: "indispensable Kaoru Ishikawa developed seven basic visual tools of quality so that the average person could analyze and interpret data. These tools have been used worldwide by companies, managers of all levels and employees. Kaoru Ishikawa Known for “Democratizing Statistics”
The Basic Seven Tools made statistical analysis less complicated. Good Visual Aids make statistical and quality control more comprehendible. What are Quality control tools?
Seven qc tools are the fundamental instruments to improve the quality of product. They are use to analyse the production process, identify the major problems, control fluctuations of product quality, and provide solutions to avoid future defects. Statistical literacy is necessary to effectively use the qc tools. These tools use statistical techniques and knowledge to accumulate the data and analyse them. THESE TOOLS ARE RELATED TO Numerical DATA processing
USER HAS TO ARRIVE AT THE SOLUTION & IMPLEMENT
Quality control tools:
Cause and Effect Diagrams
What is cause and effect diagram:
A cause and effect diagram is “a fish-bone diagram that presents a systematic representation of the relationship between the effect (result) and affecting factors (causes).” It was originally created and used by Dr. Kaoru Ishikawa and is sometimes called an Ishikawa Diagram. Also, because of its shape it is called a Fishbone Diagram. In general what you do is brainstorm ideas (causes) then group them in to categories. Those categories become the many branches of the Cause and Effect diagram. Solving a problem in a scientific manner requires clarification of a cause and effect relationship, where the effect (e.g., the result of work) varies according to factors (e.g., facilities and machines used, method of work, workers, and materials and parts used). To obtain a good work result, we must identify the effects of various factors and develop measures to improve the result accordingly. Constructing a Cause and Effect Diagram
First, clearly identify and define the problem or effect for which the causes must be identified. Place the problem or effect at the right or the head of the diagram. Identify all the broad areas of the problem.
Write in all the detailed possible causes in each of the broad areas. Each cause identified should be looked upon for further more specific causes. View the diagram and evaluate the main causes.
Set goals and take action on the main causes.
Real life example:
• Fishbone diagrams permit a thoughtful analysis that avoids overlooking any possible root causes for a need.
• The fishbone technique is easy to implement and creates an easy‐to‐understand visual representation of the causes, categories of causes, and the need. • By using a fishbone diagram, you are able to focus the group on the ʺbig pictureʺ as to possible causes or factors influencing the problem/need.
• Even after the need has been addressed, the fishbone diagram shows areas of weakness that ‐ once exposed ‐ can be rectified before causing more sustained difficulties. DISADVANTAGES
• The simplicity of a fishbone diagram can be both its strength and its weakness. As a weakness, the simplicity of the fishbone diagram may make it difficult to represent the truly interrelated nature of problems and causes in some very complex situations.
• Unless you have an extremely large space on which to draw and develop the fishbone diagram, you may find that you are not able to explore the cause and effect relationships in as much detail as you would like to.
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