The Quality Measurement Journey - Sikker Patient
The Quality Measurement Journey - Sikker Patient
The Quality Measurement Journey - Sikker Patient
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Dr. Walter A Shewhart<br />
Shewhart - Economic Control of <strong>Quality</strong> of<br />
Manufactured Product, 1931.<br />
“A phenomenon<br />
will be said to be<br />
controlled when,<br />
through the use of<br />
past experience,<br />
we can predict, at<br />
least within limits,<br />
how the<br />
phenomenon may<br />
be expected to vary<br />
in the future”<br />
©Copyright 2011 IHI/R. Lloyd<br />
“What is the variation in one system<br />
over time” Walter A. Shewhart - early 1920’s, Bell Laboratories<br />
Dynamic View<br />
UCL<br />
Static View<br />
time<br />
LCL<br />
Every process displays variation:<br />
• Controlled variation<br />
stable, consistent pattern of variation<br />
“chance”, constant causes<br />
30<br />
Static View<br />
• Special cause variation<br />
“assignable”<br />
pattern changes over time<br />
©Copyright 2011 IHI/R. Lloyd<br />
Institute for Healthcare Improvement
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