<s>
Software	B-Architecture
architecture	I-Architecture
recovery	I-Architecture
is	O
a	O
set	O
of	O
methods	O
for	O
the	O
extraction	O
of	O
architectural	O
information	O
from	O
lower	O
level	O
representations	O
of	O
a	O
software	O
system	O
,	O
such	O
as	O
source	O
code	O
.	O
</s>
<s>
Architecture	O
recovery	O
from	O
legacy	B-Device
systems	I-Device
is	O
motivated	O
by	O
the	O
fact	O
that	O
these	O
systems	O
do	O
not	O
often	O
have	O
an	O
architectural	O
documentation	O
,	O
and	O
when	O
they	O
do	O
,	O
this	O
documentation	O
is	O
many	O
times	O
out	O
of	O
synchronization	O
with	O
the	O
implemented	O
system	O
.	O
</s>
<s>
Software	B-Architecture
architecture	I-Architecture
recovery	I-Architecture
may	O
be	O
required	O
as	O
part	O
of	O
software	O
retrofits	O
.	O
</s>
<s>
Most	O
approaches	O
to	O
software	B-Architecture
architecture	I-Architecture
recovery	I-Architecture
has	O
been	O
exploring	O
the	O
static	O
analysis	O
of	O
systems	O
.	O
</s>
