Defects per Unit (DPU)

Defects per Unit (DPU)

Defects per Unit or DPU refers to Six Sigma Defects metrics. DPU measures the average number of defects in a sample. DPU considers the unit of a sample defective if any of its characteristics fail. A defect is an output that does not meet customer’s specifications. The formula to calculate DPU is below:

DPU = Total Number of Defects / Total Number Units of the sample

For example, if the number of total units is 100 and in the result of three attempts 30 units are defective, DPU is calculated as
DPU = 30/100 = 0.3 or 30 %

In terms of Six Sigma, DPU metrics is used to measure and improve the quality of business processes by defining and reducing the defects.

To calculate Defects per Unit (DPU) please follow the steps below:

• Add custom field “Number of defects” with Code “cf_number_of_defects”

Add the number of defects per each unit

• Add custom field “Number of Units” with Code “cf_number_of_units”

The custom field “Number of Units” will be displayed per task group.

• Add custom field “DPU” or “Defects per Unit” with the formula:

ToFloat($cf_number_of_defects) / ToFloat($cf_number_of_units) * 100

• On Task Tree select task group for which you need to display “Defects per Unit” and select “Custom fields options”

• Set the following custom fields settings for the custom field “Number of Defects”

- In “Settings for” select “This task group”
- select “Enable”
- in “Aggregated (for task group)” field select “Sum” from drop-down list and the custom field name

To fill in the custom field “Number of Units” at task group level, right click on task group, select “Custom fields options” and select “Edit” for the corresponding custom field

• To fill in the custom field at the task group right click on task group and select “Edit”

If you would like to calculate Total Number of Units as the sum of all units aggregated per tasks select the custom field “Number of Units” and set the following options:
- In “Settings for” select “This task group”
- select “Enable”
- in “Aggregated (for task group)” field select “Sum” from drop-down list and the custom field name

• Select custom field “DPU” and set the following settings for this custom field:

- In “Settings for” select “This task group”
- select “Enable”
- select “Calculated by custom field formula (for task group)”

Defects per Unit (DPU) on Task Tree