7 Basic Tools for Quality Control


7 Basic Tools for Quality Control 

Seven Basic Tools of Quality Control, There are seven basic tools of quality used in the Toyota Production System. Quality Control involves the collection and manipulation of data.


A bar graph that shows frequency data, it provides an easy, visual way to evaluate and compare data distribution.

2.Pareto Diagram

This is a histogram aided by the 80/20 rule—approximately 80% of problems are created by 20% of the causes. It is used to identify and prioritize problems.

3.Cause and Effect Diagram

Also called the Ishikawa Diagram or Fishbone Diagram, it is used to discover all the possible causes for a particular effect. It is the first step to effective problem solving as it creates a list of possible causes to investigate and allows the examination of worst-case scenarios.

4.Run Chart

With data arranged according to time or order, it is used to analyze processes by tracking variations along a timeline.

5.Scatter Diagram

Tracking data from the observation of two different sets of variables, it is used to study and identify the possible relationships between the pieces of data. For instance, it may be used to determine the relationship of machine speed to the number of completed parts: “If a machine’s speed is increased, how many more parts will it make?

6.Flow Chart

A pictorial representation showing all of the steps in a process, there are many variations to this type of chart. Some show information flow and others may use a computer program to generate a chart showing process sequence.

7.Control Chart

Used extensively as a quality-reporting chart along with statistical process control (SPC), it allows a process to be reviewed to see if it is within acceptable tolerances. It also can be used to determine whether a process will produce a service or product with consistent measurable properties. Control charts also known as process-behavior charts.


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