Advanced Planning, Scheduling & APS worked example

Frozen Schedule Window Check with days until production start of 7.5 days: a worked example

This scenario runs the frozen schedule window check calculation on the strong side: days until production start of 7.5 days, with every other input held at its documented default. a master scheduler needs to decide whether a schedule change should be blocked, escalated, or accepted

The inputs for this scenario

  • Days until production start: 7.5 days (raised for this scenario; the documented default is 3)
  • Frozen window start: 0 days (unchanged)
  • Planning horizon limit: 7 days (unchanged)

Working through the calculation

  • Applying the documented formula (Inside frozen schedule window = days until production start between frozen window start and planning horizon limit) to the inputs above produces each figure below.
  • At this operating point the engine returns 0 inside/outside for inside frozen schedule window, the number this scenario is built around.
  • At this operating point the engine returns -0.5 days for days to nearest schedule boundary.
  • At this operating point the engine returns 0 days for frozen window start.
  • At this operating point the engine returns 7 days for planning horizon limit.

How this compares with the baseline

  • Against the tool's baseline example, where days until production start sits at 3 days and the headline result is 1 inside/outside, this scenario comes in 100% below the baseline at 0 inside/outside.
  • Use it when an order, expedite, or schedule change comes in and you need to know if it violates the freeze policy. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Inside frozen schedule window: 0 inside/outside (headline result)
  • Days to nearest schedule boundary: -0.5 days
  • Frozen window start: 0 days
  • Planning horizon limit: 7 days

Run it with your numbers

  • Every input above is editable in the live Frozen Schedule Window Check calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.