mytest > help > Part 2. MM4XL Tools > 1. Strategic Tools > Quality Manager > 4. Acceptance Sampling > Average Outgoing Quality

Quality Manager

Average Outgoing Quality


Outgoing quality (OQ) is the quality of a lot after it has been inspected, and it is a function of incoming quality and the sampling plan. Incoming quality is the quality of material when it comes into the plant. Low incoming quality will never produce perfect outgoing quality. However, an accurate sampling plan may help to increase the level of outgoing quality when the incoming quality is low. The AOQ is found by multiplying the incoming quality by the probability of acceptance.

The picture below shows an AOQ analysis drawn with MM4XL's Quality Manager tool. The result can, of course, be printed in a worksheet.

Total Quality Management Control Charts Excel Add-In Software


Input data

The input data for the AOQ does not require a worksheet range selection. Instead the user must enter the following values in the tool window:

  • Sample size is the number of items in a lot.
  • Low, is the lower bound of the x-axis (horizontal), cell C39 in the table of section Output Results in this help chapter.
  • High, is the upper bound of the x-axis, cell C58 in the table of section Output Results in this help chapter.
  • Number of classes, e.g. rows 39-58 in the tables of section Output Results in this help chapter.
  • Number of columns. These are the lines in the charts.


Output results


The diagonal line in the chart below shows the maximum possible outgoing quality, and the curves show the outgoing quality level for different levels of defectives in the sample. For instance, 58% stands for the level of outgoing quality when the incoming quality is roughly 60%. This means that incoming quality equals outgoing quality, so that management could decide to maintain the status quo or improve outgoing quality.

Total Quality Management Control Charts Excel Add-In Software


The information in the chart is detailed in the following table that accompanies the AOQ analysis.

Total Quality Management Control Charts Excel Add-In Software


Formula
Average Outgoing Quality =Max([col]39:[col]58)
Diagonal =[previous class]+Increment
Increment =(High-Low)/Num. of Classes
Curves =BINOMIAL(D38;[sample size];C39)
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