The final lesson states the boundary: this is deterministic service snapshot arithmetic.
highlighted = computed this step
Deterministic snapshot
The calculations use fixed demand, on-hand units, and a fixed later-filled amount.
deterministic service snapshot arithmetic
Not service level
This is not a stochastic service-level or demand-distribution model.
outside scope: stochastic service level and demand distribution
Not policy proof
This does not prove lead-time uncertainty, lost-sales policy, forecasts, or customer behavior.
outside scope: lead time, policy, forecast, behavior
Honesty note
This is deterministic service snapshot arithmetic only. It does not model stochastic service levels, demand distributions, lead-time uncertainty, lost-sales policy, forecasts, or customer behavior.