What is 7QC Tools-Seven Quality Control Management Tools

Last Update in May 2026

What are 7 QC Tools? Complete Guide to Seven Quality Control Tools

7QC tools is used in industry from part/product development phase to delivery phase.7QC tools is used in various phase of continuous improvement and waste removing from process like Six Sigma. PDCA and Lean Management.

Difference Between QC and QA (Quality Control vs Quality Assurance)

7 QC Tools are 

1.Stratification

2.Histogram

3.Check Sheet

4. Fishbone Diagram (Cause & effect diagram)

5.Pareto Chart 

6.Scatter Chart

7.Control Chart

1.Stratification

  This method is used for data dividing in sub-categories by this we find out information from that we understand existing problem and solve the same.

2.Histogram

  This quality tools are used for day wise process defect data study. Histogram data helps us to prioritizing the process defect factors and also identified that in which defect area we need immediate action for defect improve.   

3.Check Sheet

  Check sheet is a table for calculating data and analyzing the same. Purpose of check sheet is listed important process defect check points and update the same or marking the status on their occurrence, from this we are understanding the progress, defect types and cause of defects.

4.Pareto Chart

   Pareto charts show us the important factors of reason from that major cause of failure occur. In Pareto chart the individual factors are represent by a bar graph in descending order of their impact and the cumulative total is shown by a line graph as shown in image below.

Kaizen (Continuous Improvement) Meaning and Benefits

This chart is based on 80-20 rules means 80% of problem occur because of 20% of major factors in process and remaining 20% of problem occurs because of 80% of minor factors.

5.Scatter Chart

  Scatter chart is used to identify the relationship between two variables; these variables often represent possible cause and effect. The diagram shows the relationship between volunteer satisfaction scores and volunteer orientation training.

6.Control Chart

    Control chart is used to see the process is stable and capable within current conditions. control chart have a average line and upper line for upper control limit(UCL) and a lower line is for lower control limit(LCL) , by comparing these data you can draw conclusion that the process is in controls or out of controls, control chart is one of the best quality tool it is very good tool for controls variations in production process.

7.Cause and Effect (Fish-bone Diagram)

When we face a problem in process, it is very critical to identify the root cause before finding a solution. This cause is grouped in categories that is materials, people, equipment, methods, environments etc. these categories give structure to the diagram. By Fish-bone diagram we structure a brainstorming session. Once the diagram built why-why analysis methods is used to identify the root cause of the effect.

• It finds the way to improve the process

• Fish-bone diagram locates bottlenecks in process

• It helps to identify root cause of the problem   

Control Chart in Statistical Process Control (SPC)

Frequently Asked Questions

1. What are the 7 QC Tools?

The 7 QC Tools are basic techniques used to solve quality problems in manufacturing and processes. They help in finding defects, analyzing data, and improving product quality.

2. What are the main seven quality control tools?

The main tools are:
Check Sheet, Histogram, Pareto Chart, Cause & Effect Diagram, Scatter Diagram, Control Chart, and Flowchart.

3. What is a Pareto Chart in QC?

A Pareto Chart helps identify the biggest problems by showing which issues are most frequent or important, based on the 80/20 rule.

4. What is a Fishbone Diagram?

A Fishbone Diagram (Cause and Effect Diagram) is used to find the root cause of a problem in a simple visual way.

5. Can 7 QC Tools improve productivity?

Yes, they help reduce defects and improve processes, which directly increases productivity and efficiency in work.