Quality Control is Better with Algebra


Marroquin, Pedro S.   (1988, ASQC)   Fisomex, Mexico

Annual Quality Congress, Dallas TX    Vol. 42    No. 0
QICID: 3514    May 1988    pp. 763-770
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Article Abstract

The purpose of this article is to demonstrate a new method of analysis based on relating the principle of "real" operation and "ideal" operation with the "cause and effect" diagram and the Pareto diagram by lineal algebra. The method was invented by the author of this article and is called "Operational Analysis". It has been brought to perfection over a period of five years with experience in 13 different kinds of industries.

This method helps to analyze those processes where tools for quality control, such as control charts or scatter diagrams are impossible to come by because of the diversity of the data and because of the problem of measuring them. This analysis is based on the experience gained by solving the problems of a chinaware factory.

The first step, is to elaborate a "cause and effect" diagram of the improvements that need to be made. The information obtained is then put down in a matrix data form.

Next, one notes what could be called the "ideal" operation. If the leader product of the competition is known, one needs to qualify the "real" operation, that is the product to be improved. With this data a Pareto diagram of cause and effect is drawn up.

In order to carry out an analysis of all the concepts explained above, one will first have to look at the Pareto diagram of the effects, to determine which is the most important one, and above all, which shows the greatest difference between the "ideal" and the "real" operation. After that, one can see in the matrix of "cause and effect", which are the causes most strongly related to the operation one wishes to improve. The Pareto diagram of causes that are related to the effect in question is then examined and the one that shows the greatest difference between the "real" operation and the "ideal" operation is chosen.

With the above results a list of the relationship between causes and effects is elaborated and the most feasible and important operations to be carried out are chosen in order to produce a working plan for the people responsible for making the improvements.


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