Although some people bristle at the term "users" (perhaps due to
some system administrators' use of the term in a derogatory
manner), it is used here with no such connotation implied. Users
are those people that use the systems and resources for which you
are responsible — no more, and no less. As such, they are
central to your ability to successfully administer your systems;
without understanding your users, how can you understand the system
resources they require?
For example, consider a bank teller. A bank teller uses a
strictly-defined set of applications and requires little in the way
of system resources. A software engineer, on the other hand, may
use many different applications and always welcomes more system
resources (for faster build times). Two entirely different users
with two entirely different needs.
Make sure you learn as much about your users as you can.
