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The 7 Essential Quality Tools for Process Improvement


QHSE QMS Quality
Quality Tool

The 7 basic tools of quality (or 7 QC Tools) were conceptualized for the first time by Kaoru Ishikawa, a professor of engineering at the University of Tokyo. They are a set of relativity simple data analysis tools used to support quality improvement efforts.

The 7 basic quality tools are essentially techniques used to identify and fix issues related to product or process quality. When an organization starts the journey of quality improvement, they normally have many low hanging fruits. These could be eliminated with these basic 7 QC tools. The 7 QC tools are fairly simple to understand and implement because they don’t require complex analytical/ statistics to use.

So What Are the 7 Basic Tools of Quality?

  1. Control chart
  2. Flow Chart
  3. Check Sheet
  4. Pareto Chart
  5. Fishbone Diagram
  6. Histogram
  7. Scatter Diagram

Flow Chart

Flow charts are the best process improvement tools that you can use to analyze a series of events. They show you how processes work visually. This tool is mainly used to map out processes to determine where the bottlenecks or breakdowns are in work processes.

Cause and Effect Diagram

The cause-and-effect diagrams can be used to understand the root causes of business problems. This analysis is designed to get into the detailed fundamental causes of the issue, without any bias. The analysis will lead to significant insight into why thingswent wrong.

Check Sheet

A check sheet is a structured, prepared form (document) for collecting and analyzing data to evaluate quality. For example, you can use a check sheet to track the number of times a specific incident occurs.


A histogram is a chart that shows how often a value, or range of value, occurswithin a given time period. Histograms provide a visual summary of a large amount of variable data. If the histogram is normal then the graph will have a bell-shaped curve.

Pareto Chart

Pareto charts are charts that contain bars and a line graph. A Pareto chart takes advantage of the 80/20 rule to visually show the categories with the largest impact on a problem. It states that 80 percent of an effect comes from 20 percent of the causes.

Control Chart

A control chart is a graph that displays trends, shifts, or patterns in the output ofa process over time. These charts allow you to identify the stability and predictability of the process and identify whether the process is under control.

Scatter Diagram

A scatter diagram or scatter plot is basically a statistical tool to represent the value of two different variables. The purpose of using this is to find the relationship between the problem (overall effect) and causes that are affecting.

Once a tool is learned, it can be adapted to various problem-solving opportunities. As with everything else, the use of these tools will require some practice and experience. Simply start with the tool that is easiest for you, and over time you will get the hang of it and become a great problem solver!

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