1. A system comprising: a contact server that tracks an identity of at least two work items, and wherein the contact center server uses an ordered list having entries associated with a plurality of elements for storing a count of the number of work items having a required queue position, RQP, wherein at least two of the work items have different RQPs based on at least two service time goals wherein each element is assigned by the contact center server, to a predetermined range of RQPs and wherein a size of a predetermined range of RQPs is different for at least some of the elements; and a Private Branch Exchange (PBX) that: receives the at least two work items; and holds the at least two work items until the contact center server instructs the PBX to distribute the at least two work items to one or more workstations.