69.Six Sigma Model

Six Sigma is a set of practices originally developed by Motorola to systematically improve processes by eliminating defects. A defect is defined as nonconformity of a product or service to its specifications.

While the particulars of the methodology were originally formulated by Bill Smith at Motorola in 1986, Six Sigma was heavily inspired by six preceding decades of quality improvement methodologies such as quality control, TQM, and Zero Defects. Like its predecessors, Six Sigma asserts the following:

Continuous efforts to reduce variation in process outputs is key to business success

Manufacturing and business processes can be measured, analyzed, improved and controlled

Succeeding at achieving sustained quality improvement requires commitment from the entire organization, particularly from top-level management

The term "Six Sigma" refers to the ability of highly capable processes to produce output within specification. In particular, processes that operate with six sigma quality produce at defect levels below 3.4 defects per (one) million opportunities (DPMO). Six Sigma's implicit goal is to improve all processes to that level of quality or better.

Six Sigma is a registered service mark and trademark of Motorola, Inc. Motorola has reported over US$17 billion in savings from Six Sigma as of 2006.

In addition to Motorola, companies that adopted Six Sigma methodologies early on and continue to practice it today include Honeywell International (previously known as Allied Signal) and General Electric (introduced by Jack Welch).

Recently some practitioners have used the TRIZ methodology for problem solving and product design as part of a Six sigma approach.

Contents:
Methodology

Statistics and robustness

Implementation Roles

Examples of Implementation

Origin

Criticism

Software Quality Assurance 

Software Quality Assurance 

Software Testing FAQs

QA Software

Er Ratnesh Porwal
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