Seven Quality Tools for Quality engineer

7 qc tool

This seven basic quality tools, which can assist an organization for problem solving and process improvements. Learn this awesome skill Free Here.

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The first who introduce the seven basic tools is Dr. Kaoru Ishikawa (1968).

name of 7 qc tools

Check Sheets 

Check sheets are sheets that are designed in advance to collect the necessary data easily and systematically, which allows the efficient checking off all items for inspection and verification. 

Check sheets are tools for collecting data. They are designed specifically for the type of data to be collected. Check sheets aid in the systematic collection of data. 

check sheets

Some examples of check sheets are daily maintenance check sheets, 

attendance records, production log books, etc

Histogram 

The histogram is a very useful tool to describe a sense of the frequency distribution of observed values of a variable. 

Histograms or Frequency Distribution Diagrams are bar charts showing the distribution pattern of observations grouped inconvenient class intervals and arranged in order of magnitude. 

histogram by wiki
histogram by wiki

It should be designed properly for those working into the operation 

the process can easily utilize and understand them.

Pareto Analysis 

Pareto Analysis introduced by an Italian economist Vilfredo Pareto, 

who worked with income and other unequal distributions in the 19th century, 

he noticed that 80% of the wealth was owned by only 20% of the 

population. Which means the majority of defects are caused by a few defective items later, the Pareto principle was developed by Juran in 1950.

Fishbone Diagram

 Kaoru Ishikawa is considered by many researchers to be the founder and the first promoter of the ‘Fishbone’ diagram (or Cause-and-Effect Diagram) for root cause analysis and the concept of Quality Control (QC) circles. 

A Cause-and-Effect Diagram is a tool that shows a systematic relationship 

between a result or a symptom of an effect and its possible causes.

fishbone diagram in 7 qc

Scatter Diagram 

When solving a problem or analyzing a situation one needs to know the relationship between two variables. 

Scatter diagram is a powerful tool to draw the distribution of information 

in two dimensions, which helps to detect and analyze a pattern 

relationships between two quality and compliance variables (as an 

independent variable and a dependent variable), an understanding if there is a relationship between them, so what kind of relationship is (Weak or strong and positive or negative).

Flowcharts

A Flowchart visualizes a picture including the inputs, activities, decision points, and outputs for using and understanding easily concerning the overall objective through the process.

flow chart
Photo by Christina Morillo

Control Charts 

Control chart or Shewhart control chart was introduced and developed by Walter A. Shewhart in the 1920s at the Bell Telephone Laboratories and is likely the most “technically sophisticated” for quality management (Montgomery, 2009). 

quality tools
Photo by Lukas

Control charts are a special form of “run chart that illustrates the amount and nature of variation in the process over time”. 

Also, it can draw and describe what has been happening in the process. 

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