<s>
Tornado	B-General_Concept
diagrams	I-General_Concept
,	O
also	O
called	O
tornado	B-Language
plots	O
,	O
tornado	B-General_Concept
charts	I-General_Concept
or	O
butterfly	O
charts	O
,	O
are	O
a	O
special	O
type	O
of	O
Bar	B-Application
chart	I-Application
,	O
where	O
the	O
data	O
categories	O
are	O
listed	O
vertically	O
instead	O
of	O
the	O
standard	O
horizontal	O
presentation	O
,	O
and	O
the	O
categories	O
are	O
ordered	O
so	O
that	O
the	O
largest	O
bar	O
appears	O
at	O
the	O
top	O
of	O
the	O
chart	O
,	O
the	O
second	O
largest	O
appears	O
second	O
from	O
the	O
top	O
,	O
and	O
so	O
on	O
.	O
</s>
<s>
They	O
are	O
so	O
named	O
because	O
the	O
final	O
chart	O
visually	O
resembles	O
either	O
one	O
half	O
of	O
or	O
a	O
complete	O
tornado	B-Language
.	O
</s>
<s>
Tornado	B-General_Concept
diagrams	I-General_Concept
are	O
useful	O
for	O
deterministic	O
sensitivity	O
analysis	O
comparing	O
the	O
relative	O
importance	O
of	O
variables	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
a	O
decision	O
maker	O
needs	O
to	O
visually	O
compare	O
100	O
budgetary	O
items	O
,	O
and	O
wishes	O
to	O
identify	O
the	O
ten	O
items	O
one	O
should	O
focus	O
on	O
,	O
it	O
would	O
be	O
nearly	O
impossible	O
to	O
do	O
using	O
a	O
standard	O
bar	B-Application
graph	I-Application
.	O
</s>
<s>
In	O
a	O
tornado	B-General_Concept
diagram	I-General_Concept
of	O
the	O
budget	O
items	O
,	O
the	O
top	O
ten	O
bars	O
would	O
represent	O
the	O
items	O
that	O
contribute	O
the	O
most	O
to	O
the	O
variability	O
of	O
the	O
outcome	O
,	O
and	O
therefore	O
what	O
the	O
decision	O
maker	O
should	O
focus	O
on	O
.	O
</s>
