Bartezzaghi [49] even proposes two approaches for
managing uncertainty typically present in lumpy demand:
Early sales: this method exploits information from
actual orders that have already been received for
future delivery. Making Bayesian use of information
from actual orders already received provides some
degree of correlation between the unknown and
known portions of the demand.
Order over‐planning: another approach for
anticipating future lumpy requirements is to exploit
the early information that a customer generates
during his purchasing process before he places his
actual order. Order over‐planning uses as
forecasting unit each single customer order instead
of the overall demand.