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THE 7 QC TOOLS
1
Introduction
The 7 QC Tools are simple statistical tools used for problem solving.
These tools were either developed in Japan or introduced to Japan by the
Quality Gurus such as Deming and Juran. In terms of importance, these are the most useful. Kaoru Ishikawa has stated that these 7 tools can be used to solve 95 percent of all problems. These tools have been the foundation of Japan's astomishing industrial resurgence after the second world war.
The following are the 7 QC Tools :
1.
2.
3.
4.
5.
6.
7.
2
Pareto Diagram
Cause & Effect Diagram
Histogram
Control Charts
Scatter Diagrams
Graphs
Check Sheets
Pareto Diagram
Pareto Diagram is a tool that arranges items in the order of the magnitude of their contribution, thereby identifying a few items exerting maximum influence. This tool is used in SPC and quality improvement for prioritising projects for improvement, prioritising setting up of corrective action teams to solve problems, identifying products on which most complaints are received, identifying the nature of complaints occurring most often, identifying most frequent causes for rejections or for other similar purposes. The origin of the tool lies in the observation by an Italian economist
Vilfredo Pareto that a large portion of wealth was in the hands of a few people. He observed that such distribution pattern was common in most fields. Pareto principle also known as the 80/20 rule is used in the field of materials management for ABC analysis. 20% of the items purchased by a company account for 80% of the value. These constitute the A items on which maximum attention is paid.
Dr.Juran suggested the use of this principle to quality control for separating the "vital few" problems from the "trivial many" now called the
"useful many".
Procedure :
The steps in the preparation of a Pareto Diagram are :
1. From the available data calculate the contribution of each individual item. 2. Arrange
1
Introduction
The 7 QC Tools are simple statistical tools used for problem solving.
These tools were either developed in Japan or introduced to Japan by the
Quality Gurus such as Deming and Juran. In terms of importance, these are the most useful. Kaoru Ishikawa has stated that these 7 tools can be used to solve 95 percent of all problems. These tools have been the foundation of Japan's astomishing industrial resurgence after the second world war.
The following are the 7 QC Tools :
1.
2.
3.
4.
5.
6.
7.
2
Pareto Diagram
Cause & Effect Diagram
Histogram
Control Charts
Scatter Diagrams
Graphs
Check Sheets
Pareto Diagram
Pareto Diagram is a tool that arranges items in the order of the magnitude of their contribution, thereby identifying a few items exerting maximum influence. This tool is used in SPC and quality improvement for prioritising projects for improvement, prioritising setting up of corrective action teams to solve problems, identifying products on which most complaints are received, identifying the nature of complaints occurring most often, identifying most frequent causes for rejections or for other similar purposes. The origin of the tool lies in the observation by an Italian economist
Vilfredo Pareto that a large portion of wealth was in the hands of a few people. He observed that such distribution pattern was common in most fields. Pareto principle also known as the 80/20 rule is used in the field of materials management for ABC analysis. 20% of the items purchased by a company account for 80% of the value. These constitute the A items on which maximum attention is paid.
Dr.Juran suggested the use of this principle to quality control for separating the "vital few" problems from the "trivial many" now called the
"useful many".
Procedure :
The steps in the preparation of a Pareto Diagram are :
1. From the available data calculate the contribution of each individual item. 2. Arrange