Recently, in designing Hewlett-Packard's new North American distributi
on center, we decomposed the modeling (and design) process into loosel
y independent pieces that could be developed in a parallel or concurre
nt fashion, rather than trying to model the entire system at once. Usi
ng this approach, we developed simulation models of four different fac
ets of the distribution center, with each model providing useful resul
ts in time to aid in system design decisions. While not all systems ca
n be easily decomposed, we believe many simulation modeling projects c
ould benefit from such an approach. The new distribution facility is n
ow operating with a 60 percent improvement in order-picking efficiency
and an 80 percent increase in shipment-preparation efficiency.