<s>
A	O
knowledge	B-General_Concept
engine	I-General_Concept
is	O
part	O
of	O
a	O
decision-support	B-Application
system	I-Application
that	O
combines	O
data	O
with	O
data	O
models	O
and	O
inference	O
rules	O
to	O
provide	O
an	O
interface	O
for	O
people	O
who	O
want	O
to	O
make	O
decisions	O
or	O
discover	O
related	O
data	O
.	O
</s>
<s>
In	O
the	O
late	O
1990s	O
,	O
the	O
Decision	B-Application
Support	I-Application
Group	O
at	O
the	O
University	O
of	O
Fribourg	O
developed	O
a	O
model	O
for	O
decision	B-Application
support	I-Application
software	I-Application
.	O
</s>
<s>
This	O
described	O
the	O
interface	O
between	O
data	O
and	O
models	O
on	O
one	O
hand	O
,	O
and	O
graphical	O
interfaces	O
for	O
exploring	O
them	O
and	O
making	O
decisions	O
on	O
the	O
other	O
,	O
as	O
a	O
knowledge	B-General_Concept
engine	I-General_Concept
.	O
</s>
<s>
With	O
the	O
rise	O
of	O
the	O
semantic	O
web	O
,	O
natural	O
language	O
processing	O
,	O
and	O
topical	O
knowledge	O
bases	O
,	O
a	O
number	O
of	O
other	O
analytical	O
tools	O
have	O
been	O
categorized	O
as	O
knowledge	B-General_Concept
engines	I-General_Concept
,	O
including	O
in	O
genomics	O
(	O
KnowEnG	O
)	O
,	O
modeling	O
human	O
action	O
(	O
PaStaNet	O
)	O
,	O
and	O
speeding	O
up	O
general-purpose	O
question	B-Algorithm
answering	I-Algorithm
.	O
</s>
<s>
General-purpose	O
search	O
and	O
discovery	O
tools	O
such	O
as	O
Wolfram	O
Alpha	O
have	O
also	O
described	O
themselves	O
as	O
knowledge	B-General_Concept
engines	I-General_Concept
.	O
</s>
