MGMT405-Seven graphical methods

# MGMT405-Seven graphical methods - MGMT 405 Six Sigma...

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MGMT 405 Six Sigma Quality Management STATISTICAL PROCESS CONTROL TOOLS (I): Seven Traditional Graphical Tools for Problem Solving Histogram Check sheet Tabular Pictorial: defect concentration diagram Pareto chart Cause and effect diagram Scatter diagram Control chart Stratification Flow chart

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M405: Seven Basic SPC Tools Page 2 § Many illustrations are adapted from Montgomery (2001), Goetsch and David (1997), Kolarik (1995)
M405: Seven Basic SPC Tools Page 3 STATISTICAL PROCESS CONTROL Statistical process control is a collection of tools that when used together can result in process stability and variability reduction Based on Ishikawa’s long experience in Japanese industry, he claims that 95 percent of quality related problems in the factory can be solved with the seven fundamental quantitative tools.

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M405: Seven Basic SPC Tools Page 4 HISTOGRAM A histogram can be used to identify the frequency of quality defect occurrence and display quality performance. General guidelines for constructing histograms: 1. Use between 4 and 20 classes - often choosing the number of classes (cells) approximately equal to the square root of the number of data points works well. 2. Use uniform width for all classes. 3. Start the lower limit for the first cell slightly below the smallest value.
Page 5 CHEEK SHEET A simple tool used to record and classify observed data. Can be used to keep track of defects. Two main types are: 1. Tabular 2. Pictorial Example . Tabular sheet: Defect and defect cause check sheets. Source:

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## This note was uploaded on 04/04/2012 for the course MGMT 405 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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MGMT405-Seven graphical methods - MGMT 405 Six Sigma...

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