The old seven skills of QC refer to checklist, analytic hierarchy process, Plato, causality diagram, scatter diagram, histogram and control diagram. In a sense, the implementation of QC Seven Law shows the advanced level of company management to a certain extent. The success or failure of these methods will become an important aspect of the company's market upgrade: almost all OEM customers will regard the application of statistical technology as an important aspect of audit, such as TDI and Motorola.

Seven new tools:

The new seven methods of QC refer to chart method, KJ method, system diagram method, matrix diagram method, matrix data analysis method, PDPC method and network diagram method. Relatively speaking, the promotion and application of the new seven technologies in the world is far less than that of the old seven technologies, and it has never become an important aspect of customer audit.

The so-called old and new are only in time, not that the new is better than the old.

The so-called seven QC tools are only seven methods to find and correspond to quality problems, and do not involve specific operations. So there is no specific "tool" available. The tools mentioned in the lecture actually refer to 14 "technology" above.

Data expansion:

Seven tools of QC (new)

1, diagram

Correlation diagram, also known as relationship diagram, was put forward by Professor Akio Kikuchi of Yingqing University in Japan in 1960s. It is a chart used to analyze the complex relationship between things, such as "cause and effect" and "purpose and means". It can help people find solutions to problems from the logical relationship between things.

2. Affinity diagram

Affinity diagram method, also known as KJ method, was initiated by Kawakita Jiro. It is a method to sort out a large number of collected language materials such as opinions or ideas about unknown things or unclear facts according to their correlation (similarity), so as to make the problem clear, obtain unified understanding and coordinate work, and facilitate the solution of the problem.

3. System diagram

System diagram is a method to systematically develop the purpose to be achieved and the measures or methods to be taken, and draw a chart to clarify the focus of the problem and find the best means or methods.

4, process decision-making program diagram (PDPC)

Process decision program chart, also called PDPC (process decision program chart) method, is a method to analyze the factors that can lead to various results with the progress of the situation and determine an optimal process to achieve the ideal results.

6. Matrix diagram

Matrix diagram method is a method to find out the paired factors from the events of multidimensional problems, arrange them into a matrix diagram, and then analyze the problems according to the matrix diagram to determine the key points. It is a good method to explore the problem through comprehensive thinking of various factors.

7. Matrix data analysis chart.

Matrix data analysis is to analyze multivariable and complex causality. If the relationship between elements on the matrix diagram can be expressed quantitatively by data, the results can be sorted and analyzed more accurately. This matrix diagram method which can be represented by data is called matrix data analysis. Among the seven new QC tools, data matrix analysis is the only method to use data to analyze problems, but the results still need to be graphically represented.

8. Indication chart

The arrow bar diagram method is a method to represent the steps and operations needed in project implementation with network diagram according to the affiliation.

Source: Baidu Encyclopedia: Seven Skills of Quality Control