7 QC Tools

The “7 QC Tools” are a set of seven basic graphical techniques used in quality management to visualize data and identify root causes of problems. These tools, also known as the “Seven Basic Quality Tools,” are foundational to process improvement methodologies like Six Sigma and Total Quality Management (TQM). They help in understanding and resolving issues related to quality, process stability, and data analysis.
The Seven QC Tools are:
Cause-and-Effect Diagram (Ishikawa or Fishbone Diagram): Used to identify potential causes of a problem.
Scatter Diagram: Used to explore the relationship between two variables.
Histogram: Used to visualize the distribution of data within groups.
Control Chart: Used to monitor process stability and detect special causes of variation.
Pareto Chart: Used to identify the “vital few” causes that contribute to most of the problem.
Check Sheet: Used to collect and organize data, often for identifying patterns.
Stratification: Used to analyze data by grouping items to identify patterns.