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Project Delivery Estimate
For any project. we begin calculating the work items for the project and the estimate work time and force for each.
To have an accurate delivery estimate, you should also calculate a total buffer of 20 %.
PLUS
Add the calendar holidays and regular vacations for the working team on the project. You will then have a new delivery date that is a few months later than the original one.
Make sure that you verify all that stuff before giving a new delivery estimate after each change request.
Calculations:-
. If the work items estimate was by time then , just modifying your project management tool and adding the right values to it does it all.
. If you are using Agile or some other way to manage your project, estimates are given according to the business value.
You should then calculate the regular team velocity regarding the business values. i.e. If your teams delivers 100 business values in a 10 work days sprint.
Then if the whole team has a 10 day vacation , then you should add 100 business values for the vacations items before making your calculations.
Vacations should be calculated thoroughly according to your calendar and the work hours for each candidate and how that affects the whole team velocity. ( like having a team mix of full timers and part timers ) .
Tamer Maher 