tailieunhanh - Six Sigma Projects and Personal Experiences Part 2

Tham khảo tài liệu 'six sigma projects and personal experiences part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6 Six Sigma Projects and Personal Experiences 4. Why six sigma Does yield is good enough for an organization With yield we say the organization operates at 4 to 5 Sigma level. Taking into account some real world examples with yield we come across the following example scenarios which are surely unacceptable in customer s point of view Unsafe drinking water almost 15 minutes each day 5400 arterial by pass failures each year Visas issued to 50 dangerous persons each year By moving to Six Sigma level with yield significant improvements have taken place resulting in very high quality with almost nil defects and very good customer satisfaction as shown below Unsafe drinking water only few seconds a day 18 arterial bypass failures No visas issued to dangerous persons The following real world examples explain the importance and need for achieving six sigma level quality. Comparison of performace improvement with and acceptence Scenarios acceptance Sigma Level 4 to 5 Sigma acceptance Sigma Level 6 Sigma Arterial bypass failures in an year 54O0 18 Commercial aircraft take off aborted each year 31 536 107 Train wrecks a year 180 1 Visa issued to dangerous persons 50 none Table 2. Comparison of performance improvement at different sigma levels 5. Lean Lean thinking Lean Thinking was an another quality and productivity improvement methodology introduced in Toyota Production Systems TPS which is based on the concept of elimination of waste in processes which had resulted in productivity gain and improvement of speed and flow in the value stream. The principle of Lean can be stated as a relentless pursuit of the perfect process through wastage elimination in the value stream. Lean identifies three different kinds of wastes using Japanese terminology from the Toyota Production System where lean originated muda waste of time and materials mura unevenness variation and muri the overburdening of workers or systems . Every .