Footnotes

... resource 1

In this paper, we assume a one-to-one correspondence between resources working on a work item and work items being processed. In other words, resources cannot work on different work items simultaneously and it is not possible that multiple resources work on the same work item. In Section 3.7 we will discuss and relax this requirement slightly.

... queue 2

Note that it is impossible to actually differentiate between the last two alternatives.