work in process bottleneck
Generally speaking, the WIP [Equation (9)] is an
independent objective, and reducing the WIP serves
only as a means of obtaining short throughput time
from a logistics perspective. However, if the goal is to
minimise tied-up capital or release available floor
space, the WIP can be treated separately from the
throughput time from the economic point of view. To
describe the tied-up capital, it is necessary to compile
the order value of each operation and include it in the
calculation. On the other hand, if making floor space is
mainly focused, the supplementary information about
the actual space required each specific operation is
needed.