Mucking around, I think I found the answer to my first question above - for
anyone that is interested it's one generic solution to workload shift
coverage constraint definitions ie. you have demand during a day, and you
need to cover the demand with staff working varying shift lengths.
# example: 0..47 periods in half hr blocks representing time of day (00:00
to 23:30)
# shifts: shift lengths to be used eg. 4 and 8, or 4..10 hr shifts
# perstart would be 0 in this case
# AND (most important) perdpershift = how many periods in 1 shift length
unit ie. if hourly shifts,
# and 1/2hr time increments in day = 2
subject to c{i in Periods}:
sum{shift in Shifts,period in Periods : period >= max(perstart,(i-shift *
perdpershift +1)) and period<=i} starts[period,shift]>=demand[i];
Pete
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