When you solve support issues and you want to be prepared for the
future you need to know how much capacity is required on average to cover
your Support activities. The calculation is easy but it requires
effort to find the data needed for the calculation.
First step in the calculation
To calculate the capacity required take the amount of Support issues
registered over the last few years:
Year Support Issues registered
-
2003
2500
-
2004
3000
-
2005
6000
-
2006
5000
-
2007
8000
-
2008
4000
Total
28500
In total you handled 28500 support issues in the last six years. Now on
average for this source you had to fix 4071 support issues a
year.
Step two
How long on average does it take you to handle a support issue? To
be sure about the amount of hours your require hour registration
on support issues for a certain amount of time. Measure a year
long to get a good average. Let's take 3 hours for this
calculation.
So to handle 4071 support issues on average it
requires 12213 hours on a yearly basis. The amount of hours required
depend on the knowledge level of your Support team, the complexity of the
software, the quality of the documentation and last but not
least the quality of the software. When Development has done a lousy job
your require more support capacity to fill the gaps.
- 12213 hours / 8 hours = 1526.6 days
- 1526.6 days / 5 days = 305.3 workweeks
- 305.3 workweeks / 40 hours = 7.6 FTE on a yearly basis
Note! FTE = one fulltime resource based on 40 hours per week
Step three
You have different kind of Support Issues like business standstills, major
problems, etc. When you have a major difference in the amount per
kind or time spend spend per type your calculation have to be tuned
on that situation.
So let say the outcome of your investigation is as follows:
Type
of issue
Average time spend in hours
- Business
standstill
8
- Major
Problems 4
- Minor
Problems 1
Type
of issue
Amount of Issues per type
- Business
standstill
10
- Major
Problems 1015
- Minor
Problems 3046
Step four
The calculation:
- (10 issues * 8 hours) + ( 1015 issues * 4 hours) + (3046 issues * 1
hours)=
- 80 hours + 4060 hours + 3046 hours = 7186
- 7186 hours / 8 hours = 868.25 days
- 868.25 days / 5 days = 179.65 workweeks
- 179.65 workweeks / 40 hours = 4.5 FTE on a yearly basis
Note! FTE = one fulltime resource based on 40 hours per week