Six-Sigma refers to a quality improvement and business strategy concept started by
Motorola, USA in 1986. In statistical
terms, Six-Sigma is the abbreviated form
of 6 standard deviations from the mean.
Six-Sigma is a set of methodologies used
by businesses to achieve extremely low
failure rates in any process. It
provides the techniques and tools to
improve the capability and reduce the
defects in any process.
Each Six Sigma project carried out
within an organization follows a defined
sequence of steps and has quantified
financial targets (cost reduction or
profit increase). A six sigma process is
one in which 99.99966% of the products
manufactured are statistically expected
to be free of defects (3.4 defects per
million opportunities or 3.4 DPMO).
Six Sigma projects follow two methods
inspired by Deming's Plan-Do-Check-Act
key aspects of the current process.
the data to investigate and verify
the current process based upon data
analysis using techniques.
the future state process to ensure that
there is no deviations from target.
DMADV or DFSS:
design goals that are consistent with
and identify CTQs (characteristics that
are Critical To Quality).
to develop and design alternatives.
details, optimize the design, and plan
for design verification.
the design, set up pilot runs, implement
the production process and hand it over
to the process owner(s).
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