PERT to estimate the values of orders’ cycle time, even when there are no historical data, by
current dynamic workload of fab: Previous proposed models in the literature mainly determine orders’
cycle time by either on-hand historical data on cycle time or a deterministic ratio called “actual to
theoretical ratio”. When a new product is going to be manufactured, there is no historical data on its cycle
time value. Also, a deterministic ‘actual to theoretical ratio’ cannot reflect the dynamic of fab workload.
The proposed model estimates cycle time by fab workload and order characteristics while keeping away
from mentioned previous methods’ shortages.