Statistical Quality Control- History and Techniques

‘Statistical Quality Control is a Big Challenge for Firm in this Modern Time’

Today, In this Modern Time, Who as a customer wants less quality products?? Every Customer want to cover the Benefit of their money which they paid for the product.

So, Will Company do their losses for the entire period?? Is it Possible??

There is one Idea behind this. Either there is Small or Big Company. The No. Of months or Years firms Firm make their own losses by providing quality products at less prices, the more profit they will generate from you for a long time.

Because No one Company wants to work as a NGO after listed as a Pvt. Ltd Company.

But How to Control the Quality of the Product so that you can earn more profit as well as sales..

That will be done by Statistical Quality Control.

Meaning of Statistical Quality Control

Statistical Quality Control means to control the quality of the products by using statistical methods which helps the firm to get more profit.

History of Statistical Quality Control

Walter A. Shewhart has discovered the Statistical Quality Control Concept. He is from United States of America.

He understood how Quality Control has changed from the Production Concept to the Customer Oriented Approach.

Now Customer has become the King of the Market.

Variations in Quality

Variations in Quality is done due to Chance and Assignable Causes.

Chance Causes are those causes in which there are very minor variations. These causes are very difficult to identify. To suspect these causes is also very uneconomical.

Assignable Causes are those causes in which the variations are not minor. In this causes, change in variations can be due to worker’s mistake, problems in the machine etc.

Techniques of Statistical Quality Control

The techniques of Statistical Quality Control are basically defined into major two types that are-

Process Control- In Process Control, the Quality Control Officer checks the quality of the product when the product is under the process.

In Process Control, it’s been checked that whether the Process is under Control or out of Control. This is also Known as Statistical Quality Control Charts.

               Statistical Quality Control Charts

  These Control Charts can be measurable or Countable.

For Countable, Control Charts for Attributes will be used.

Control Charts for Attributes are divided into 3 Charts that are-

np Chart

P Chart

C Chart

For Measurable, Control Charts for Variables will be used.

                      Control Charts for Variables are divided    into 2 charts that are-

x Chart

R Chart

Product Control-

In this, the Quality of a Product is controlled when the Product is in semi-finished form.

In this, they used a procedure to accept or reject the quality that is known as Acceptance Sampling

Acceptance Sampling is also divided into 3 parts that are-

Single Sampling Plan

Double Sampling Plan

Multi-Stage Sampling Plan