<s>
Streaming	B-Algorithm
conformance	I-Algorithm
checking	I-Algorithm
is	O
a	O
type	O
of	O
doing	O
conformance	B-Algorithm
checking	I-Algorithm
where	O
the	O
deviation	O
(	O
if	O
exists	O
)	O
is	O
reported	O
directly	O
when	O
it	O
happens	O
.	O
</s>
<s>
Instead	O
of	O
event	O
log	O
,	O
streaming	B-Algorithm
conformance	I-Algorithm
checking	I-Algorithm
techniques	O
take	O
event	O
stream	O
and	O
process	O
model	O
as	O
input	O
and	O
for	O
each	O
received	O
event	O
from	O
the	O
stream	O
,	O
it	O
will	O
be	O
compared	O
with	O
the	O
model	O
.	O
</s>
<s>
The	O
conventional	O
conformance	B-Algorithm
checking	I-Algorithm
techniques	O
use	O
event	O
log	O
as	O
input	O
.	O
</s>
<s>
After	O
the	O
event	O
log	O
is	O
completely	O
recorded	O
,	O
conformance	B-Algorithm
checking	I-Algorithm
techniques	O
are	O
applied	O
and	O
the	O
deviations	O
,	O
if	O
they	O
exist	O
will	O
be	O
shown	O
.	O
</s>
<s>
The	O
traditional	O
conformance	B-Algorithm
checking	I-Algorithm
techniques	O
are	O
not	O
able	O
to	O
deal	O
with	O
such	O
large	O
data	O
sets	O
,	O
i.e.	O
,	O
the	O
data	O
does	O
not	O
fit	O
the	O
main	O
memory	O
.	O
</s>
<s>
Not	O
monitor	O
in	O
real-time	O
:	O
The	O
conformance	B-Algorithm
checking	I-Algorithm
algorithms	O
perform	O
in	O
a-posteriori	O
fashion	O
,	O
hence	O
,	O
the	O
deviations	O
can	O
only	O
be	O
detected	O
after	O
they	O
have	O
occurred	O
for	O
an	O
amount	O
of	O
time	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
streaming	B-Algorithm
conformance	I-Algorithm
checking	I-Algorithm
techniques	O
use	O
event	O
stream	O
as	O
input	O
.	O
</s>
<s>
With	O
this	O
kind	O
of	O
data	O
,	O
the	O
conformance	B-Algorithm
checking	I-Algorithm
can	O
be	O
continuously	O
performed	O
along	O
the	O
stream	O
,	O
i.e.	O
,	O
for	O
each	O
executed	O
activity	O
,	O
the	O
analysis	O
will	O
be	O
directly	O
calculated	O
if	O
that	O
activity	O
causes	O
any	O
deviation	O
based	O
on	O
a	O
given	O
process	O
model	O
.	O
</s>
<s>
Hence	O
,	O
this	O
kind	O
of	O
conformance	B-Algorithm
checking	I-Algorithm
provides	O
a	O
continuous	O
way	O
of	O
monitoring	O
a	O
process	O
and	O
detecting	O
the	O
deviations	O
in	O
real-time	O
.	O
</s>
<s>
The	O
fundamental	O
difference	O
between	O
online	O
and	O
offline	O
conformance	B-Algorithm
checking	I-Algorithm
is	O
the	O
completeness	O
of	O
the	O
input	O
.	O
</s>
<s>
Due	O
to	O
this	O
difference	O
,	O
the	O
conventional	O
conformance	B-Algorithm
checking	I-Algorithm
algorithms	O
are	O
not	O
(	O
fully	O
)	O
applicable	O
in	O
the	O
online	O
context	O
and	O
needed	O
to	O
be	O
adjusted	O
.	O
</s>
