Introduction:
QC is the use of techniques (mainly statistical) to achieve, maintain and try to improve on quality standards of products and services.
Definition:
QC is therefore the use of techniques (mainly statistical) to achieve, maintain and try to improve on quality standards of products and services. It co-ordinates the links between the following activities:
Stages:
The concept of control
The concept of control includes all the activities which enable organisations to achieve their objectives efficiently and economically. It is an ongoing process and based on continuously trying to rectify, improve and introduce new concepts. There are three types of control which can be recognized:
(i) Irregular control: Spasmodic approaches to controlling quality (e.g. when a customer complains);
(ii) Routine control: Regular control by carrying out inspections at specific stages of the process of providing goods/services;
Fig: Various types of Statistical Quality Control techniques
(iii) Scientific control:Control through measurement and analysis using statistical sampling theory. This more or less controls the process (e.g. a repetitive production process)