This research examines the relationships between the
independent variables; lot size, sequencing rule, and shop
type/product mix and the ’dependent variables; work-in-process,
machine utilization, flowtime, and leadtime. These
relationships have seldom been investigated by academicians.
There is no satisfactory method available in the literature
today that can be used to accurately estimate leadtime.
This research developed methods for leadtime estimation. A
leadtime estimation method would be invaluable to the
production planner, for it would enable the person to decide
when the job should be released to the shop.
The experimental system considered in this research is
an eight machine shop. Three different shop types, a
jobshop, modified flowshop, and a flowshop, were modelled.
Each shop type had eight different product types being
manufactured. Two different sequencing rules, SPT and FIFO,
were used. The entire system was analyzed via simulation on
an IBM P.C. using SIMAN system simulation concepts.
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