<s>
Vensim	B-Application
is	O
a	O
simulation	B-Application
software	I-Application
developed	O
by	O
Ventana	O
Systems	O
.	O
</s>
<s>
It	O
primarily	O
supports	O
continuous	B-General_Concept
simulation	I-General_Concept
(	O
system	O
dynamics	O
)	O
,	O
with	O
some	O
discrete	B-General_Concept
event	I-General_Concept
and	O
agent-based	O
modelling	O
capabilities	O
.	O
</s>
<s>
Vensim	B-Application
provides	O
a	O
graphical	O
modeling	O
interface	O
with	O
stock	O
and	O
flow	O
and	O
causal	B-Application
loop	I-Application
diagrams	I-Application
,	O
on	O
top	O
of	O
a	O
text-based	O
system	O
of	O
equations	O
in	O
a	O
declarative	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
Models	O
may	O
be	O
calibrated	O
against	O
data	O
using	O
optimization	O
,	O
Kalman	O
Filtering	O
or	O
Markov	B-General_Concept
chain	I-General_Concept
Monte	I-General_Concept
Carlo	I-General_Concept
methods	I-General_Concept
.	O
</s>
<s>
Sensitivity	O
analysis	O
options	O
provide	O
a	O
variety	O
of	O
ways	O
to	O
test	O
and	O
sample	O
models	O
,	O
including	O
Monte	B-Algorithm
Carlo	I-Algorithm
simulation	I-Algorithm
with	O
Latin	O
Hypercube	O
sampling	O
.	O
</s>
<s>
Vensim	B-Application
model	O
files	O
can	O
be	O
packaged	O
and	O
published	O
in	O
a	O
customizable	O
read-only	O
format	O
that	O
can	O
be	O
executed	O
by	O
a	O
freely	O
available	O
Model	O
Reader	O
.	O
</s>
<s>
Vensim	B-Application
is	O
general-purpose	O
software	O
,	O
used	O
in	O
a	O
wide	O
variety	O
of	O
problem	O
domains	O
.	O
</s>
