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About
Defect Removal Efficiency (DRE) |
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Defect Removal
Efficiency is a software quality metric where the effectiveness of
defect removal in an activity or project is measured in terms of the
number of faults discovered during its entire duration divided by
the total number of faults discovered during and after the entire
project or activity duration.
For a project or activity to be effective in detecting / removing
errors, DRE should be equal to 1 (100%) or close to this value. |
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| Help |
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opens the Help page. |
| Calculate
DRE |
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calculates the DRE value considering that the field data are correct. |
| Clear
All |
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clears the information displayed in the Data and Results area of the
page.
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| Pop-up
menu |
- The Results part of the page is a Java applet which the background
color can be changed through a pop-up menu. The pop-menu can be invoked
by right-clicking the area outside of the the text box.
Aside from changing background colors, the pop-up menu has the these
extra commands:
* Show the last 10 calculations for comparison purposes.
* Clear memory that holds the the last 10 calculations. |
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| 1) |
On
the 'Project / Activity' field, enter name of Project or the name
of the software engineering activity.
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| 2) |
On
the 'Errors Found Before Delivery...' field:
- If data pertains to a "Project", enter the total quantity of errors
that is found before the software is delivered.
- If data pertains to an "Activity", enter the total quantity of errors
that is found during the software engineering activity.
NOTE: Data to be entered in this field should be equal to zero (for
no errors found) or greater but both fields cannot have zero values.
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| 3) |
On
the 'Errors Found After Delivery...' field:
- If data pertains to a "Project", enter the total quantity of errors
that is found after the software is delivered.
- If data pertains to an "Activity", enter the total quantity of errors
that is found after the software engineering activity is finished.
These errors should be traceable to the errors found within that activity.
NOTE: Data to be entered in this field should be equal to zero (for
no errors found) or greater but both fields cannot have zero values.
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| 4) |
Click
on the 'Calculate DRE' button to find out the Defect-Removal-Efficiency
value.
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| 5) |
OPTIONAL:
Use pop-up menu to recall the last 10 DRE
Calculations made in one user session. This is useful for data from
different projects or activities. |
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Harvey Roy Divinagracia
November 2000 |