A plan is credible only when demand and usable capacity meet.
Nominal headcount is not capacity. Leaders must account for business-as-usual demand, mandatory work, scarce skills, interruptions and coordination overhead before choosing what the organisation can genuinely commit to.
Commit only after operational demand, mandatory work and interruption buffer are visible.
Northstar cannot add a new priority without naming which existing commitment moves, reduces or stops.
The evidenceOne demand view, an explicit capacity envelope and a visible trade-off make the consequence discussable before commitment.