A Modified Giffler and Thompson algorithm combined with dynamic slack time is used to
allocate machines resources in dynamic nature. It was compared with a Real Time Order
Promising (RTP) algorithm. The performance of modified Giffler and Thompson and RTP
algorithms are measured by mean tardiness. The result shows that modified Giffler and Thompson
algorithm combined with dynamic slack time provides significantly better result compared with
RTP algorithm in terms of mean tardiness.