<s>
In	O
computer	B-General_Concept
science	I-General_Concept
and	O
in	O
mathematics	O
,	O
abstraction	B-Application
model	I-Application
checking	I-Application
is	O
for	O
systems	O
where	O
an	O
actual	O
representation	O
is	O
too	O
complex	O
in	O
developing	O
the	O
model	O
alone	O
.	O
</s>
