Useful tools are collected in TQC , to widen the activity of SPC . Those are called "seven QC tools" and "new seven QC tools". Those tools are beginners of QC activity.
Statistical approach and visual approach are key-points. Graphs are important.
"Seven QC tools" is also called "Q7"
Some people say that "control chart" is one of the "graph" and stratified sampling is one of the seven QC tools.
New seven QC tools are made to analyze non-quantity information (knowledge) mainly. Those tools are could be said as reasoning methods.
"New seven QC tools" is also called "N7"
Most of Q7 are tools for quantity data analysis. But Check-Sheet and Cause-and-Effect Diagram are for knowledge analysis.
Most of N7 are tools of knowledge analysis. But Matrix-Data-Analysis is for quantity data analysis. And it is mathematically too difficult to study for beginners.
From other viewpoint, Q7 and N7 are not only for Quality Study today because they are introduced as useful tools for various business use. So the name, "QC", is not suitable.
I tried to arrange " Tools of Data Science (G7, W7, M7) " to improve these problems.
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