<s>
A	O
known	B-Error_Name
error	I-Error_Name
is	O
a	O
software	B-Error_Name
bug	I-Error_Name
that	O
has	O
not	O
been	O
fixed	O
,	O
but	O
has	O
a	O
known	O
root	O
cause	O
and	O
either	O
has	O
little	O
disruptive	O
impact	O
on	O
the	O
end	O
user	O
or	O
a	O
known	O
work	O
around	O
.	O
</s>
<s>
Tested	O
systems	O
are	O
often	O
described	O
as	O
"	O
free	O
from	O
known	B-Error_Name
errors	I-Error_Name
"	O
in	O
recognition	O
that	O
complex	O
systems	O
cannot	O
be	O
proven	O
to	O
be	O
error	O
free	O
.	O
</s>
<s>
In	O
IT	O
Operations	O
known	B-Error_Name
errors	I-Error_Name
may	O
be	O
logged	O
in	O
a	O
system	O
's	O
known	B-Error_Name
error	I-Error_Name
database	I-Error_Name
(	O
KEDB	O
)	O
which	O
is	O
then	O
used	O
to	O
prioritize	O
changes	O
and	O
to	O
develop	O
customer	O
support	O
reference	O
information	O
where	O
a	O
work	O
around	O
exists	O
.	O
</s>
