<s>
Systems	O
are	O
described	O
as	O
process	O
algebra	O
terms	O
that	O
are	O
then	O
mapped	O
to	O
labeled	B-Application
transition	I-Application
systems	I-Application
(	O
LTSs	O
)	O
.	O
</s>
<s>
Properties	O
can	O
be	O
verified	O
by	O
checking	O
equivalences	O
between	O
concrete	O
and	O
abstract	O
system	O
descriptions	O
or	O
by	O
model	B-Application
checking	I-Application
temporal	O
formulas	O
(	O
expressed	O
as	O
μ-calculus	B-Application
or	O
ACTL	O
)	O
over	O
the	O
obtained	O
LTS	O
.	O
</s>
