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Class Twenty Seven Notes

# Class Twenty Seven Notes - Page 1 of 21 Class Twenty Seven...

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Page 1 of 21 April 24, 2009 (9:44pm) J:\SWT\HA4315\Class notes\Spring 2009 version\C_27 spg09.wpd Reduce, recycle, reuse!! Class Twenty Seven Agenda & Objectives HA 4315 I. Logistics and Objectives A. Memory Jogger II , pp. 132-136, measuring process capacity B. Six Sigma C. Six Sigma in health care II. Process capability indices The idea behind a process capability index is that computation of one number allows you to know if the process can meet the specifications of the customer. The language for describing these is what I have used before. If the UCL and the LCL fall inside of the customer’s specification limits (USL & LSL) then the process is described as “capable.” The formula required computes the variance from either side of the mean of the process. This means two different formulas are needed. One measures the capability to handle the upper specification limit (USL). The other measures the capability to handle the lower specification limit (LSL). Once the two values are computed, the formula chooses the smaller of the two. The purpose of having both sides of the specification is to ensure that the values that come from the computation are centered. This formula is called C pk . The overall formula for C pk computes the distance the USL and the LSL are from the mean. Each is divided by three standard deviations. The formula is: . ( 29 ( C USL X X LSL pk = - - min ; 3 3 σ σ The idea is to compute both sides and then take the minimum. That is what the semicolon between the two formulas is saying. If the minimum comes out higher than one you are okay. The higher the better. The standard deviation can be found using Excel. That value is 1.128. For the housekeeping data we used in the last class. This would be the second data set, after the manager revamped the process because the previous system would not meet the specifications of 60 minutes, +/- 10 minutes. The first process was reliable but not capable of meeting the specifications, thus not valid. The average was 70 minutes. The second version of the process, revised, came in at an average of 59 minutes but had the potential to exceed the USL and the LSL owing to the amount of the variation in the process. A. Applying C pk to our cleaning example

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Page 2 of 21 April 24, 2009 (9:44pm) J:\SWT\HA4315\Class notes\Spring 2009 version\C_27 spg09.wpd Reduce, recycle, reuse!! Summers thinks he has style! That’s a joke. Let’s see what the C pk would say about the improved process housekeeping developed for nursing service. You may recall that it did not meet the specifications, but it was close enough for the nurse supervisor. The necessary values from the housekeeping process and the nursing specifications were given on a table on page ?. As is my style , I set this up in Excel to work out the answers. Essentially, I created another template.
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Class Twenty Seven Notes - Page 1 of 21 Class Twenty Seven...

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