Headcount is not available capacity
Forty people are not forty available people. There is holiday, training, absence, management time, sales support, new joiners ramping up, and skills that only serve part of the demand. Planning on the number of contracts produces commitments that delivery cannot meet.
The useful subtraction starts from the calendar and deducts absences, internal work and already confirmed assignments, always per person before aggregating. And it is worth distinguishing confirmed from tentative visibly: when both are painted the same, capacity disappears on paper long before it does in reality.
- Working hours, holidays and absences deducted from the calendar
- Management time and sales support reserved
- Confirmed assignments kept separate from tentative ones
- An allocation percentage on every assignment