<s>
A	O
causal	B-Application
loop	I-Application
diagram	I-Application
(	O
CLD	O
)	O
is	O
a	O
causal	O
diagram	O
that	O
aids	O
in	O
visualizing	O
how	O
different	O
variables	O
in	O
a	O
system	O
are	O
causally	O
interrelated	O
.	O
</s>
<s>
Causal	B-Application
loop	I-Application
diagrams	I-Application
are	O
accompanied	O
by	O
a	O
narrative	O
which	O
describes	O
the	O
causally	O
closed	O
situation	O
the	O
CLD	O
describes	O
.	O
</s>
<s>
According	O
to	O
George	O
Richardson	O
's	O
book	O
"	O
Feedback	O
Thought	O
in	O
Social	O
Science	O
and	O
Systems	O
Theory	O
"	O
,	O
the	O
first	O
published	O
,	O
formal	O
use	O
of	O
a	O
causal	B-Application
loop	I-Application
diagram	I-Application
to	O
describe	O
a	O
feedback	O
system	O
was	O
Magoroh	O
Maruyama	O
's	O
1963	O
article	O
"	O
The	O
Second	O
Cybernetics	O
:	O
Deviation-Amplifying	O
Mutual	O
Causal	O
Processes	O
"	O
.	O
</s>
