Analysis of the results show that
machines B and F are the most highly utilized. The mean number
in the system shown in cell J8 is the number of all four products.
To compute the number of an individual product, we must first
find the throughput time for the product by adding the station
times for the machines through which the products pass. For
example product 1 passes through machines A, B, E and F. Adding
the mean times for each of these stations we find the throughput
time for product 1, that is 0.789 months. Multiplying this
by the flow rate of the product, which is 30 per month, we
find the mean number of product 1 in the system, 23.67. This
is the Work-in-Process, or WIP, for the product.
Many kinds of analysis of this system are possible using the
Queuing network model.