2.4 Advanced Process Flow Variability

2.4 Advanced Process Flow Variability - BUSINESS PROCESS...

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Click to edit Master subtitle style 7/7/11 BUSINESS PROCESS ANALYSIS FUNDAMENTALS PROCESS CAPACITY ANALYSIS Variability in Line Processes 11 MGSC 485 – Business Process Management Moore School of Business University of South Carolina
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7/7/11 22 Variability is any departure from uniformity and may be random or controllable Sources of variability include : setups • work pace variation failures • differential skill levels shortages • engineering change orders yield loss/rework • customer orders operator unavailability • product differentiation Flow Line Variability
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7/7/11 33 Measuring Process Variability CV , variation of t coefficien time process of deviation standard rate processing mean 1 r job a of time process mean p = = = = = = p p p p p p t c σ t t σ
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7/7/11 44 Process Variability – Trial Machine 1 Machine 2 Machine 3 1 22 5 5 2 25 6 6 3 23 5 5 4 26 35 35 5 24 7 7 6 28 45 45 7 21 6 6 8 30 6 6 9 24 5 5 10 28 4 4 11 27 7 7 12 25 50 500 13 24 6 6 14 23 6 6 15 22 5 5 t p 25.1 13.2 43.2 s p 2.5 15.9 127.0 c p 0.1 1.2 2.9 c p 2 0.01 1.4 8.6 Class LV MV HV
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7/7/11 55 Illustrating Flow Variability t Low variability arrivals t High variability arrivals Measuring Flow Variability t m e a n t i m e b e t w e e n a r r i v a l s r a r r i v a l r a t e s t d d e v o f t i m e b e t w e e n a r r i v a l s c t c o e f o f i a t i o n o f e r a
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