The 7 effective Quality Control (QC) Tool


The 7 effective Quality Control (QC) Tool

The 7 quality control tools are the basic fundamental means of achieving world-class quality standards in the eyes of our customers.


Anything that gets measured can be improved. Traditionally the seven Quality tools have played a key role in identifying a problem and subsequently find adequate and permanent improvement solutions.

Let us understand in details.

  1. Control Charts:

Control charts are the graphical representation of how the processes are changing over time. It helps us identify the unwanted/sudden changes in the process and subsequently helps us to identify and bridge the gaps in real-time.


It is also popularly known as the Shewhart Charts, named after the physician Walter A Shewhart 

  1. Flow Charts:

It’s a diagrammatic representation that helps us to define complex process flows and identify bottlenecks. It helps us to identify bugs in the process and also acts as a blueprint for the end to end process.


Popularly also known as the Business flow diagram was introduced by Frank Gilbreth (Father of Management Engineering) & his wife Lillian Gilbreth.  They are popularly known as the pioneers in Time and Motion Study.

  1. Pareto Chart:

Named after Vilfredo Pareto, it’s a bar graph represented in a way that it helps us to identify and work on the vital few against the trivial many. It is also popularly known as the 80-20 principal.


It helps to focus/identify and address the top 20 issues/gaps which will help us resolve 80% of the problems.

  1. Histogram:

Also known as the frequency diagram, Histograms were introduced by the popular mathematician Karl Pearson. It can be developed into a graphical representation of the data and helps us identify the frequency distribution of its occurrence and categories.


In simple words, to draw a histogram, we will plot the independent variable on the horizontal axis and the dependent variable by the vertical axis.

  1. Fishbone:

For me, no brainstorming session is complete if there is no fishbone analysis. One of the most effective and interesting quality tools which looks like the bone of a fish.


Introduced by a Japanese Innovator – Kaoru  Ishikawa,  also called after his name Ishikawa diagram or a cause and effect diagram. It is also a highly effective tool which helps us visually identify the potential causes of a problem. Subsequently, we can find possible solutions.

  1. Scatter Plot:

In simple words, Scatter plots help us to understand the relationship between two sets of data/information. We can identify the trend/relationships between two sets of data.


Very helpful in identifying outliers in the data and easy to identify correlations between two sets of data.

  1. Check Sheets:

Also known as the Tally sheet is used for collecting data in a structured form. It helps us to keep track of the completion of the work stage. A highly versatile tool used across the organizations typically for driving improvements thru LEAN Projects.


One of the key objectives is to ensure the data is collected easily and in a more accurate manner.

Some of the key benefits of the 7 QC tools are:


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