<s>
In	O
software	B-General_Concept
engineering	I-General_Concept
,	O
syntactic	B-Application
methods	I-Application
are	O
techniques	O
for	O
developing	O
correct	O
software	B-Application
programs	I-Application
.	O
</s>
<s>
The	O
techniques	O
attempt	O
to	O
detect	O
,	O
and	O
thus	O
prevent	O
,	O
certain	O
kinds	O
of	O
defects	O
(	O
bugs	B-Error_Name
)	O
by	O
examining	O
the	O
structure	O
of	O
the	O
code	O
being	O
produced	O
at	O
its	O
syntactic	O
rather	O
than	O
semantic	O
level	O
.	O
</s>
<s>
Syntactic	B-Application
methods	I-Application
are	O
often	O
used	O
when	O
formal	B-Architecture
methods	I-Architecture
are	O
not	O
an	O
option	O
,	O
and	O
are	O
often	O
a	O
simpler	O
and	O
,	O
more	O
importantly	O
,	O
cheaper	O
alternative	O
.	O
</s>
<s>
In	O
non-mission-critical	O
systems	O
,	O
formal	B-Architecture
methods	I-Architecture
may	O
prove	O
to	O
be	O
too	O
expensive	O
for	O
the	O
benefit	O
they	O
provide	O
.	O
</s>
<s>
When	O
formal	B-Architecture
methods	I-Architecture
prove	O
too	O
costly	O
,	O
a	O
system	O
can	O
be	O
checked	O
solely	O
on	O
its	O
syntax	B-Application
.	O
</s>
<s>
"	O
A	O
new	O
algorithm	O
for	O
slicing	O
unstructured	O
programs.	O
"	O
</s>
