<s>
PAT	B-Application
(	O
Process	O
Analysis	O
Toolkit	O
)	O
is	O
a	O
self-contained	O
framework	O
for	O
composing	O
,	O
simulating	O
and	O
reasoning	O
of	O
concurrent	O
,	O
real-time	O
systems	O
and	O
other	O
possible	O
domains	O
.	O
</s>
<s>
PAT	B-Application
implements	O
various	O
model	B-Application
checking	I-Application
techniques	O
catering	O
for	O
different	O
properties	O
such	O
as	O
freedom	O
from	O
deadlock	B-Operating_System
and	O
divergence	B-Application
,	O
reachability	O
,	O
LTL	O
properties	O
with	O
fairness	O
assumptions	O
,	O
refinement	O
checking	O
and	O
probabilistic	O
model	B-Application
checking	I-Application
.	O
</s>
<s>
To	O
achieve	O
good	O
performance	O
,	O
advanced	O
optimization	O
techniques	O
are	O
implemented	O
in	O
PAT	B-Application
,	O
e.g.	O
</s>
<s>
partial	B-Application
order	I-Application
reduction	I-Application
,	O
,	O
process	O
counter	O
abstraction	O
.	O
</s>
