<s>
Functional	B-Application
testing	I-Application
is	O
a	O
quality	O
assurance	O
(	O
QA	O
)	O
process	O
and	O
a	O
type	O
of	O
black-box	O
testing	O
that	O
bases	O
its	O
test	O
cases	O
on	O
the	O
specifications	O
of	O
the	O
software	O
component	O
under	O
test	O
.	O
</s>
<s>
Functional	B-Application
testing	I-Application
is	O
conducted	O
to	O
evaluate	O
the	O
compliance	O
of	O
a	O
system	O
or	O
component	O
with	O
specified	O
functional	O
requirements	O
.	O
</s>
<s>
Functional	B-Application
testing	I-Application
usually	O
describes	O
what	O
the	O
system	O
does	O
.	O
</s>
<s>
Since	O
functional	B-Application
testing	I-Application
is	O
a	O
type	O
of	O
black-box	O
testing	O
,	O
the	O
software	O
's	O
functionality	O
can	O
be	O
tested	O
without	O
knowing	O
the	O
internal	O
workings	O
of	O
the	O
software	O
.	O
</s>
<s>
Functional	B-Application
testing	I-Application
does	O
not	O
imply	O
that	O
you	O
are	O
testing	O
a	O
function	O
(	O
method	O
)	O
of	O
your	O
module	O
or	O
class	O
.	O
</s>
<s>
Functional	B-Application
testing	I-Application
tests	O
a	O
slice	O
of	O
functionality	O
of	O
the	O
whole	O
system	O
.	O
</s>
<s>
Functional	B-Application
testing	I-Application
differs	O
from	O
system	O
testing	O
in	O
that	O
functional	B-Application
testing	I-Application
"	O
verifies	B-Application
a	O
program	O
by	O
checking	O
it	O
against	O
...	O
design	O
document(s )	O
or	O
specification(s )	O
"	O
,	O
while	O
system	O
testing	O
"validate[s]	O
a	O
program	O
by	O
checking	O
it	O
against	O
the	O
published	O
user	O
or	O
system	O
requirements.	O
"	O
</s>
<s>
The	O
concept	O
of	O
incorporating	O
testing	O
earlier	O
in	O
the	O
delivery	O
cycle	O
is	O
not	O
restricted	O
to	O
functional	B-Application
testing	I-Application
.	O
</s>
<s>
Functional	B-Application
testing	I-Application
has	O
many	O
types	O
:	O
</s>
