Further, the guest operating system has the most information about the workload's memory use and should be able to make the best page replacement decisions.

For them the key decisions are: when do they want to retire, how much do they want to save, and what minimum proportion of their final salary, or "replacement rate", do they wish to target?

These methods have played an important guiding role for pipe operators so that they can make correct decisions on the repair, maintenance, and replacement of pipes.