S.Q.C(Statistical Quality Control)

 Statistical Quality Control (SQC)  is one of the most important application of statistical technique which plays a very important and significant role in the field of industry. These techniques are based on theory of probability and sampling and is extensively used in all types of industries such as aircraft, textile, automobile, petroleum, telephones, transportation, medicines, plastic goods, electrical equipment, etc.

This SQC was introduced by W.A Shewhart of Bell Telephone Company of U.S.A in 1924. He introduced the idea of process control with the help of control charts. In the same year, Harold F. Dodge and Roming also of Bell Telephone Company, developed the idea of product control with the help of sampling inspection plans.

Definition : SQC refers to the use of statistical methods in the monitoring and maintaining of the quality of products and services.
Quality refers to the sum of attributes or properties that describes a product.
These are generally expressed in terms of specific products characterstics such as length, width, weight, color, etc

Quality control means those activities which assure that quality creation is perfomed in such a manner that the resulting product will perform its intended functions.

Concept : It is the application of statistical technique to accept or reject products already produced or to control the process of product quality  while the later is called Process Control and former is called Acceptance Sampling.