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- An entity is an object of interest in the
system. E.g. customers in a bank.
- An attribute is a property of an entity. E.g. the
checking account balance of the customer.
- An activity represents a time period of specified
length. Here the time period is emphasized because often the
simulation involves time. E.g. deposit money into the checking account
at a specified date and time.
- The state of a system is defined to be that collection
of variables necessary to describe the system at any time, relative to
the objectives of the study. E.g. number of busy tellers, number of
customers waiting in line.
- An event is defined as an instantaneous occurrence that
may change the state of the system. E.g. customer arrival, addition of
a new teller, customer departure.