Before we add our resource schedule for the rework operation, let's first define our new

$16-$hour day. We do this in the Replication Parameters tab of the Run $>$ Setup option, by

changing the Hours Per Day from $24$ to $16($ignore the warning about Calendars that you

might get here$).$ While we're in this dialog box, let's also change our Time Units for the

Replication Length to Days and the Replication Length itself to $10$ days.

You can start the definition of a resource schedule in either the Resource or Schedule

data module. We'll start with the Resource data module. When you click on this module

from the Basic Process panel, the information on the current resources in the model will

be displayed in the spreadsheet view of the model window along the bottom of your

screen. Now click in the Type column for the Rework resource row and select Based on

Schedule from the list. When you select this option, Arena will add two new columns

to the spreadsheet view$-$Schedule Name and Schedule Rule. Note that the Capacity cell

for the Rework resource has been dimmed because the capacity will instead be based on

a schedule. In addition, the cells for two new columns are also dimmed for the other three

resources because they still have a fixed capacity. Next you should enter the schedule

name $($e$.$g$.,$ Rework Schedule$)$ in the Schedule Name cell for the Rework resource.

Finally, you need to select the Schedule Rule, which can affect the specific timing of

when the capacity defined by the schedule will actually change. There are three options

for the Schedule Rule: Wait $($the default$),$ Ignore, and Preempt. If a capacity decrease of

$x$ units is scheduled to occur and at least $x$ units of the resource are idle, all three options

immediately cause $x$ units of the resource unit$($s$)$ to become Inactive. But if fewer than $x$

units of the resource are idle, each Schedule Rule responds differently: $($The three

options are illustrated in Figure $4-6.)$