Information Technology Reference
In-Depth Information
Step
Activities
Description
5D
Time Estimating
Procedure 5D
If you have no historical data, use your judgment to
estimate the development time from the estimated added
and modified size.
6
Time and Size
Prediction
Intervals
- If you used regression method A or B, calculate the 70%
prediction intervals for the time and size estimates.
- If you did not use the regression method or do not know
how to calculate the prediction interval, calculate the
minimum and maximum development time estimate
limits from your historical maximum and minimum
productivity for the programs written to date.
Exit Criteria
- Completed estimated and actual entries for all pertinent
size categories
- Completed PROBE Calculation Worksheet with size and
time entries
- Plan and actual values entered on the Project Plan
Summary
PROBE Calculation Worksheet (Added and Modified)
Student
Program
PROBE Calculation Worksheet (Added and Modified)
Size
Time
Added size (A):
A
=
BA
+
PA
Estimated Proxy Size (E):
E
=
BA
+
PA
+
M
PROBE estimating basis used:
(A, B, C, or D)
Correlation: (R
2
)
Regression Parameters:
β
0
Size and Time
Regression Parameters:
β
1
Size and Time
Projected Added and Modified
Size (P):
P
=
β
0size
+
β
1size
*
E
Estimated Total Size (T):
T
=
P
+
B
−
D
−
M
+
R
Estimated Total New Reusable
(NR):
sum of
*
items
Estimated Total Development
Time:
Time
=
β
0time
+
β
1time
*
E
Prediction Range:
Range
Upper Prediction Interval:
UPI
=
P
+
Range
Lower Prediction Interval:
LPI
=
P
−
Range
Prediction Interval Percent:
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