<s>
A	O
control-flow	B-Application
diagram	I-Application
(	O
CFD	O
)	O
is	O
a	O
diagram	O
to	O
describe	O
the	O
control	O
flow	O
of	O
a	O
business	O
process	O
,	O
process	O
or	O
review	O
.	O
</s>
<s>
Control-flow	B-Application
diagrams	I-Application
were	O
developed	O
in	O
the	O
1950s	O
,	O
and	O
are	O
widely	O
used	O
in	O
multiple	O
engineering	O
disciplines	O
.	O
</s>
<s>
They	O
are	O
one	O
of	O
the	O
classic	O
business	O
process	O
modeling	O
methodologies	O
,	O
along	O
with	O
flow	B-Language
charts	I-Language
,	O
drakon-charts	B-Language
,	O
data	B-Application
flow	I-Application
diagrams	I-Application
,	O
functional	O
flow	O
block	O
diagram	O
,	O
Gantt	B-Application
charts	I-Application
,	O
PERT	O
diagrams	O
,	O
and	O
IDEF	O
.	O
</s>
<s>
A	O
control-flow	B-Application
diagram	I-Application
can	O
consist	O
of	O
a	O
subdivision	O
to	O
show	O
sequential	O
steps	O
,	O
with	O
if-then-else	O
conditions	O
,	O
repetition	O
,	O
and/or	O
case	O
conditions	O
.	O
</s>
<s>
There	O
are	O
several	O
types	O
of	O
control-flow	B-Application
diagrams	I-Application
,	O
for	O
example	O
:	O
</s>
<s>
In	O
software	O
and	O
systems	O
development	O
,	O
control-flow	B-Application
diagrams	I-Application
can	O
be	O
used	O
in	O
control-flow	O
analysis	O
,	O
data-flow	O
analysis	O
,	O
algorithm	B-General_Concept
analysis	I-General_Concept
,	O
and	O
simulation	O
.	O
</s>
<s>
PERT	O
,	O
state	O
transition	O
,	O
and	O
transaction	O
diagrams	O
are	O
examples	O
of	O
control-flow	B-Application
diagrams	I-Application
.	O
</s>
<s>
A	O
flow	B-Application
diagram	I-Application
can	O
be	O
developed	O
for	O
the	O
process	O
[	O
control	O
system ]	O
for	O
each	O
critical	O
activity	O
.	O
</s>
<s>
The	O
figure	O
presents	O
an	O
example	O
of	O
a	O
performance-seeking	O
control-flow	B-Application
diagram	I-Application
of	O
the	O
algorithm	O
.	O
</s>
