<s>
A	O
functional	B-Application
block	I-Application
diagram	I-Application
,	O
in	O
systems	O
engineering	O
and	O
software	B-General_Concept
engineering	I-General_Concept
,	O
is	O
a	O
block	B-Application
diagram	I-Application
.	O
</s>
<s>
The	O
functional	B-Application
block	I-Application
diagram	I-Application
can	O
picture	O
:	O
</s>
<s>
The	O
block	B-Application
diagram	I-Application
can	O
use	O
additional	O
schematic	O
symbols	O
to	O
show	O
particular	O
properties	O
.	O
</s>
<s>
Functional	B-Application
block	I-Application
diagrams	I-Application
have	O
been	O
used	O
in	O
a	O
wide	O
range	O
applications	O
,	O
from	O
systems	O
engineering	O
to	O
software	B-General_Concept
engineering	I-General_Concept
,	O
since	O
the	O
late	O
1950s	O
.	O
</s>
<s>
Many	O
specific	O
types	O
of	O
functional	B-Application
block	I-Application
diagrams	I-Application
have	O
emerged	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
functional	O
flow	O
block	B-Application
diagram	I-Application
is	O
a	O
combination	O
of	O
the	O
functional	B-Application
block	I-Application
diagram	I-Application
and	O
the	O
flowchart	B-Language
.	O
</s>
<s>
Many	O
software	O
development	O
methodologies	O
are	O
built	O
with	O
specific	O
functional	B-Application
block	I-Application
diagram	I-Application
techniques	O
.	O
</s>
<s>
An	O
example	O
from	O
the	O
field	O
of	O
industrial	O
computing	O
is	O
the	O
Function	B-Application
Block	I-Application
Diagram	I-Application
(	O
FBD	O
)	O
,	O
a	O
graphical	O
language	O
for	O
the	O
development	O
of	O
software	O
applications	O
for	O
programmable	B-Architecture
logic	I-Architecture
controllers	I-Architecture
.	O
</s>
