<s>
Metacompilation	B-Application
is	O
a	O
computation	O
which	O
involves	O
metasystem	O
transitions	O
(	O
MST	O
)	O
from	O
a	O
computing	O
machine	O
M	O
to	O
a	O
metamachine	O
M	O
 '	O
which	O
controls	O
,	O
analyzes	O
and	O
imitates	O
the	O
work	O
of	O
M	O
.	O
Semantics-based	O
program	B-Application
transformation	I-Application
,	O
such	O
as	O
partial	O
evaluation	O
and	O
supercompilation	B-Application
(	O
SCP	O
)	O
,	O
is	O
metacomputation	O
.	O
</s>
<s>
The	O
Fox	O
paper	O
reviews	O
one	O
strain	O
of	O
research	O
which	O
was	O
started	O
in	O
Russia	O
by	O
Valentin	O
Turchin	O
's	O
REFAL	B-Language
system	O
in	O
the	O
late	O
1960s-early	O
1970s	O
and	O
became	O
known	O
for	O
the	O
development	O
of	O
supercompilation	B-Application
as	O
a	O
distinct	O
method	O
of	O
program	B-Application
transformation	I-Application
.	O
</s>
<s>
After	O
a	O
brief	O
description	O
of	O
the	O
history	O
of	O
this	O
research	O
line	O
,	O
the	O
paper	O
concentrates	O
on	O
those	O
results	O
and	O
problems	O
where	O
supercompilation	B-Application
is	O
combined	O
with	O
repeated	O
metasystem	O
transitions	O
.	O
</s>
