The Overlap Optimum and Overlap sequence types use a percentage to define the amount of time before the next operation can start.  For example, if 10% is given as the percentage overlap, the next operation will not start until 10% of current operation is completed:

       Seq        Op Id        Operation Runtime          Next Op Starts after 10% of Runtime Hours

        1         10            20 hours                        2 hours

        2         20            10 hours                        1 hour

        3         30            15 hours                        1.5 hours

If Overlap Optimum is used,  if a downstream operation is faster the DMS scheduling engine with automatically adjust the flow to compensate so the resource is not scheduled to sit idle waiting for parts from the previous resource.  Optimum will reduce the total load on individual resources, but may result in a later schedule completion date because of local efficiency instead of global efficiencies.