BF looks at the areas protected by a buffer and focuses on those incidents where most of the buffer has been used, and then gives the “almost late” orders high priority, which can be translated as expediting
GREEN Ignore zone: we don’t really expect the order show up at the protected area..
YELLOW The monitor zone: Attention to but no reaction as there is still enoughtime to expedite and it might not be needed..
RED Emergency zone: there is a need to react, otherwise the order will be late.
