wht is six sigma ??
CA CS CIMA Prakash Somani (Landmark Group) (23502 Points)
01 September 2009wht is six sigma ??
Mutyam
(Employment)
(83 Points)
Replied 01 September 2009
Six Sigma is a data driven improvement methodology aimed to improve mean and reduce variation in the desired CTQ (critical-to-quality) characteristics. CTQ would be any dimension of the performance be it schedule adherence, on time delivery, response time, resource utilisation etc.,
CA. Shikha
(Chartered Accountant)
(4143 Points)
Replied 01 September 2009
Six Sigma was originally developed as a set of practices designed to improve manufacturing processes and eliminate defects, but its application was subsequently extended to other types of business processes as well.[2] In Six Sigma, a defect is defined as anything that could lead to customer dissatisfaction.[1]
The particulars of the methodology were first formulated by Bill Smith at Motorola in 1986.[3] Six Sigma was heavily inspired by six preceding decades of quality improvement methodologies such as quality control, TQM, and Zero Defects,[4][5] based on the work of pioneers such as Shewhart, Deming, Juran, Ishikawa, Taguchi and others.
Like its predecessors, Six Sigma asserts that –
Features that set Six Sigma apart from previous quality improvement initiatives include –
The term "Six Sigma" is derived from a field of statistics known as process capability studies. Originally, it referred to the ability of manufacturing processes to produce a very high proportion of output within specification. Processes that operate with "six sigma quality" over the short term are assumed to produce long-term defect levels below 3.4 defects per million opportunities (DPMO).[6][7] 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.[8] Motorola has reported over US$17 billion in savings[9] from Six Sigma as of 2006.
Other early adopters of Six Sigma who achieved well-publicized success include Honeywell (previously known as AlliedSignal) and General Electric, where the method was introduced by Jack Welch.[10] By the late 1990s, about two-thirds of the Fortune 500 organizations had begun Six Sigma initiatives with the aim of reducing costs and improving quality.[11]
In recent years, Six Sigma has sometimes been combined with lean manufacturing to yield a methodology named Lean Six Sigma.
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