[LT Guppy]

There are two main theories on how berthings are divided.
1) you live with people who have the same job
2) different jobs are spread evenly through the different berthings.

The thought behing 1 is that if you need the engineers for a middle of the night casualty, you only have to wake up one berthing. The idea behind 2 is that if the ship is attacked and a berthing is wiped out, you don't loose all the engineers, or all the combat systems operators at the same time.