OPS.10.2:10 - Architectural Rationale

Precedence, resource competition and calendars enter together because each can exclude a superficially plausible plan. The precedence-only calculation remains a useful reduced case and lower bound when resources are relaxed. It becomes the full answer only when the omitted conditions do not invalidate its assignment.

Feasibility precedes reserve use: a gap in an impossible plan is no protection. Reserve is then interpreted against a specific event and selected choices, allowing early and deferred policies to be compared without claiming that one always improves delivery.

The operating construction supplies phase occupations, appointments, available windows, receiving deadlines and the changed remainder. MMP.10 and CMP provide general formulation and search; repeating their algorithms would not recover these operating facts. Keeping criticality conditional also lets a planner revise a local sequence without mistaking it for the sustained-flow constraint of the whole service.