Process capability studies have considerable impact

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process-capability studies have considerable impact on many management decision problems that occur over the product cycle, including make or buy decisions, plant and process improvements that reduce process variability, and contractual agreements with customers or vendors regarding product quality.
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Control charts may be classified into two general types: VARIABLE Control Charts If the quality characteristic can be measured and expressed as a number on some continuous scale of measurement ATTRIBUTES Control Charts each unit of product as either conforming or nonconforming on the basis of whether or not it possesses certain attributes, or we may count the number of nonconformities (defects) appearing on a unit of product.
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Deming’s 14 Points for Management Do not rely on mass inspection to ―control‖ quality.
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Deming’s 14 Points for Management Focus on continuous improvement.
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Deming’s 14 Points for Management Break down the barriers between functional areas of the business.
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Deming’s 14 Points for Management Eliminate targets, slogans, and numerical goals for the workforce.
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Deming’s 14 Points for Management Eliminate numerical quotas and work standards.
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The Juran Trilogy Planning Control Improvement
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Analysis of Patterns on Control Charts
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A control chart may indicate an out-of- control condition when one or more points fall beyond the control limits or when the plotted points exhibit some nonrandom pattern of behavior.
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Run a sequence of observations of the same type
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Pattern Recognition recognizing systematic or nonrandom patterns on the control chart and identifying the reason for this behavior.
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Western Electric Handbook (1956) set of decision rules for detecting nonrandom patterns on control charts. One point plots outside the three-sigma control limits, Two out of three consecutive points plot beyond the two-sigma warning limits, Four out of five consecutive points plot at a distance of one-sigma or beyond from the center line, or 4. Eight consecutive points plot on one side of the center line.
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VARIABLE A single measurable quality characteristic, such as a dimension, weight, or volume.
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x Control Chart Control of the process average or mean quality level is usually done with the control chart for means.
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Monitoring Process Variability s control chart R control chart
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  • Fall '19
  • Control Chart, Process capability, W. Edwards Deming, R Charts

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