Questions that arise at each level
What is the unit of information transferred from level to level (word, block, page table entry, page)
Where is that unit of info placed (directed by ISA, hardware, restricted mapping, general mapping)
How do we find if that unit of info is here (depends on mapping)
What happens if there is no room for it (structural hazard, replacement algorithm)
What happens when we change the contents of the info. unit (i.e., what happens on a write)