Six Sigma at a glance

  • Six Sigma – A systematic methodology for quality management
  • TQM & ISO 9000 are other similar quality management methodologies
  • It uses various theories and tools for process improvement
  • Improves process and tries to reduce time, cost, resource etc.
  • Denoted by , where σ is a Greek symbol
  • Six-Sigma represents the statistical term standard-deviation
  • Standard Deviation is the deviations from average
  • Standard Deviation = unit of measurement of deviation 
  • More deviation from average/mean means more defects
  • A business/product which follows 6σ will have only 3.4 DPMO
  • DPMO = Defects Per Million Opportunities
  • Success rate of Six Sigma is 99.99966%
  • Three key holders of quality = Customer, Employee and Process
  • Six Sigma is not about quick-fix
  • 6σ was first implemented by Motorola Corporation in 1980
  • Traditional 6σ certification levels are:
    • Yellow Belt
    • Green Belt
    • Black Belt
    • Master Black Belt and
    • Champion
  • DMAIC model
    • Define
    • Measure
    • Analyze
    • Improve
    • Control
  • PDCA
    • Plan
    • Do
    • Check
    • Act
  • DMADV
    • Define
    • Measure
    • Analyze
    • Design
    • Verify
  • DFSS = DMADV, also known as Design For Six Sigma