The 7 Basic Quality Tools for Process Improvement

Quezon City, Philippines.

The seven basic tools of quality was first emphasized by Kaoru Ishikawa, a professor of engineering at Tokyo University, and the father of “quality circles”. According to him, if used properly, they should be able to address practically 95% of all quality concerns and/ or issues.

You may start your quality journey by familiarizing with these tools, with the end-in-view of progressing towards eventually mastering them. Clicking on the live-link below will bring you to the corresponding ASQ-page elaborating each of them: 1.) When to use, 2.) How to construct, and 3.) Analysis-procedure.

  1. Cause-and-effect diagram (also called Ishikawa or fishbone chart): Identifies many possible causes for an effect or problem and sorts ideas into useful categories.
  2. Check sheet: A structured, prepared form for collecting and analyzing data; a generic tool that can be adapted for a wide variety of purposes.
  3. Control charts: Graphs used to study how a process changes over time.
  4. Histogram: The most commonly used graph for showing frequency distributions, or how often each different value in a set of data occurs.
  5. Pareto chart: Shows on a bar graph which factors are more significant.
  6. Scatter diagram: Graphs pairs of numerical data, one variable on each axis, to look for a relationship.
  7. Stratification: A technique that separates data gathered from a variety of sources so that patterns can be seen (some lists replace “stratification” with “flowchart” or “run chart”).

The following templates developed by ASQ will help you get started using the aforementioned seven basic quality tools. Just download the spreadsheets and begin entering your own data.

Excerpted from Nancy R. Tague’s The Quality Toolbox, Second Edition, ASQ Quality Press, 2005, page 15.

Published by Ramon H. Enriquez MIE&M, RME

Ramon ("Mon") Hojas Enriquez is a retired business executive who now spends his available time sharing the wisdom that he gained from his post-graduate academic preparations and 35+ years of hands-on industry practice here (Philippines) and abroad; as an Independent Management Consultant and as a Professional Lecturer/ Resource Speaker. He now focuses on management consulting, education and training---in the fields of Supply-chains, Strategy-execution, and Decision-support. His affiliations with relevant leading global industry associations such as: The Association for Supply Chain Management (ASCM), Project Management Institute (PMI), Institute for Operations Research and Management Sciences (INFORMS), American Society for Quality (ASQ), International Institute for Business Analysis (IIBA), Institute for Supply Management (ISM), System Dynamics Society (SDS), among others) keeps him informed and updated on the current and future developments in his above-mentioned fields of specialization. Mon is a lifelong Systems Thinker and an avid micro-Blogger. His hobby includes Photography and the Graphics-arts, Singing, Guitar-playing, Songwriting, and Audio recording & mixing. When not traveling or visiting Clients, he normally spends his time at his office cum studio or, QC-home with his Wife and dog.