operations management quality tools 3

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BA 470 Chapter 2 Quality Tools Homework Assignment

Every important activity in a value stream should be measured. A run chart is common tool used to monitor these measurements over time. A run chart is alternatively called a time series chart or a trend chart. A run chart is basically a Statistical Process Control Chart without the upper and lower limits. For a run chart, the value stream measurement is displayed according to the Y axis and the time/sequence is displayed on the X axis.

A histogram is a tool to graphically display the frequency of the value stream measurements without regard for time. For a histogram, the value stream measurements are displayed on the X axis and the frequency of the measurements, according to dimensional categories, are displayed on the Y axis. The description of histogram on pages 63 and 65 in the text is misleading. These descriptions are more akin to a bar chart, or when the categories are organized from most frequent to least frequent, to a pareto chart. A correct description of histogram, also called a frequency distribution chart, can be found at http://www.socialresearchmethods.net/kb/statdesc.php, under the subheading section title The Distribution, and including Tables 1 and 2.

When analysis of the values stream measurements using a run chart and a histogram indicate that the performance is deficient, then the potential causes for “gaps” in performance can be analyzed with a Cause-and-Effect Diagram.

When data are collected for these potential causes (or categories) of poor performance, then the data can be displayed with a Pareto chart, visually indicating the cause/categories by number or percentage, with the cause/category with the greatest number/frequency in the far left column and the cause/category with the least number/percentage in the far right column.

Instructions:  

choose some process activity that has measurable data, some of the following are examples:

Waiting line to order food

Car Wash

Cashing or depositing a check at the bank

Any manufacturing process (cars, paper products, coke cans, etc.)

 Mailing systems (UPS, US Postal, FedEx)

Remember to use upper and lower limits.

After choosing some process activity which is measured, I am asking you to complete  the following assignment deliverables. Computer generated (excel)  submissions are accepted.

1.Create a run chart and make a comment about the performance.

2.Create a histogram and make a comment about the performance.

3.   

4.Create a pareto chart based upon causes/categories of performance deficiency, and make a comment about the results of the analysis.

Your resources may include your own personal experience or first-hand observation, your interview of someone with personal experience or first-hand observation, an article, case study, or web site. Do not cut and paste from any source, except for brief quotations that are properly cited.

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