Capacity Model
Illustrative for a fictional field service platform, Rivenhall. Nine engineers across a thirteen-week quarter.
| Line | Engineer-weeks | Of nominal | Basis |
|---|---|---|---|
| Nominal capacity | 117 | 100% | 9 engineers x 13 weeks. The only number anybody quotes |
| Less carryover | -17 | -15% | Re-estimated, after one initiative was stopped |
| Less interrupt load | -18 | -15% | Measured at 15.4% across three quarters. Assumed at 10% for three years |
| Less leave and holidays | -11 | -9% | Booked, plus one parental leave from week 6 |
| Less non-negotiable maintenance | -8 | -7% | Framework end-of-life and two deprecations dated inside the quarter |
| Available for new commitments | 63 | 54% | With the dashboard builder stopped |
| Available if nothing is stopped | 49 | 42% | 14 fewer, which is 22% of what remains |
| Committed | 59 | 50% | 6 initiatives. Fits inside 63 |
| Unallocated buffer | 4 | 3% | Deliberately small, with a named rescope when it goes |
| Asked for at the start | 119 | 102% | 11 candidates plus everything unfinished. Nearly double |
Every line under nominal is a number somebody already had. None of it is pessimism, and 54% available is not a problem to fix: raising it by shaving the interrupt measurement is how the figure becomes fictional again.