Statistical
Quality Control (SQC)
It is one of the most
important applications of statistical techniques in industry. The term Quality
means a level or standard of a product which depends on Material, Manpower,
Machines, and Management (4M’s). Quality Control ensures the quality
specifications all along them from the arrival of raw materials through each of
their processing to the final delivery of goods. This technique is used in almost
all production industries such as automobile, textile, electrical equipment,
biscuits, bath soaps, chemicals, petroleum products etc.
Quality Control is a
powerful technique used to diagnose the lack of quality in any of the raw
materials, processes, machines etc… It is essential that the end products
should possess the qualities that the consumer expects from the manufacturer.
There are two causes of
variation which affects the quality of a product, namely
1. Chance Causes (or)
Random causes
2. Assignable Causes
These are small
variations which are natural and inherent in the manufacturing process. The
variation occurring due to these causes is beyond the human control and cannot
be prevented or eliminated under any circumstances. The minor causes which do
not affect the quality of the products to an extent are called as Chance Causes
(or) Random causes. For example Rain, floods, power cuts, etc…
The second type of
variation which is present in any production process is due to non-random
causes. The assignable causes may occur in at any stage of the process, right
from the arrival of the raw materials to the final delivery of the product.
Some of the important factors of assignable causes are defective raw materials,
fault in machines, unskilled manpower, worn out tools, new operation, etc.
The main purpose of
SQC is to device statistical techniques which would help in elimination of
assignable causes and bring the production process under control.
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