<s>
A	O
use	B-Language
case	I-Language
diagram	I-Language
is	O
a	O
graphical	O
depiction	O
of	O
a	O
user	O
's	O
possible	O
interactions	O
with	O
a	O
system	O
.	O
</s>
<s>
A	O
use	B-Language
case	I-Language
diagram	I-Language
shows	O
various	O
use	B-Architecture
cases	I-Architecture
and	O
different	O
types	O
of	O
users	O
the	O
system	O
has	O
and	O
will	O
often	O
be	O
accompanied	O
by	O
other	O
types	O
of	O
diagrams	O
as	O
well	O
.	O
</s>
<s>
The	O
use	B-Architecture
cases	I-Architecture
are	O
represented	O
by	O
either	O
circles	O
or	O
ellipses	O
.	O
</s>
<s>
While	O
a	O
use	B-Architecture
case	I-Architecture
itself	O
might	O
drill	O
into	O
a	O
lot	O
of	O
detail	O
about	O
every	O
possibility	O
,	O
a	O
use-case	B-Architecture
diagram	O
can	O
help	O
provide	O
a	O
higher-level	O
view	O
of	O
the	O
system	O
.	O
</s>
<s>
It	O
has	O
been	O
said	O
before	O
that	O
"	O
Use	B-Language
case	I-Language
diagrams	I-Language
are	O
the	O
blueprints	O
for	O
your	O
system	O
"	O
.	O
</s>
<s>
Due	O
to	O
their	O
simplistic	O
nature	O
,	O
use	B-Language
case	I-Language
diagrams	I-Language
can	O
be	O
a	O
good	O
communication	O
tool	O
for	O
stakeholders	O
.	O
</s>
<s>
Siau	O
and	O
Lee	O
conducted	O
research	O
to	O
determine	O
if	O
there	O
was	O
a	O
valid	O
situation	O
for	O
use	B-Language
case	I-Language
diagrams	I-Language
at	O
all	O
or	O
if	O
they	O
were	O
unnecessary	O
.	O
</s>
<s>
What	O
was	O
found	O
was	O
that	O
the	O
use	B-Language
case	I-Language
diagrams	I-Language
conveyed	O
the	O
intent	O
of	O
the	O
system	O
in	O
a	O
more	O
simplified	O
manner	O
to	O
stakeholders	O
and	O
that	O
they	O
were	O
"	O
interpreted	O
more	O
completely	O
than	O
class	O
diagrams	O
"	O
.	O
</s>
