An issue is either a matter of fact or a matter of opinion.
Determining which of these is the case is extremely
important because an argument about each kind of issue
requires different tactics and expectations.
Most basically, an issue is a matter of fact when there are
generally agreed upon criteria for settling it.  On the
other hand, there are no agreed upon criteria for settling
an issue that is a matter of opinion.
It is helpful to remember that when two people are on
opposite sides of an issue that is a matter of fact, it is
impossible that both of them are correct.  This is not the
case with a matter of opinion.
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