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.
- 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
- 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.
- 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.
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.
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.
- 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.
- 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: