<s>
The	O
MICRO	B-Application
Relational	I-Application
Database	I-Application
Management	I-Application
System	I-Application
was	O
the	O
first	O
large-scale	O
set-theoretic	O
database	B-Application
management	I-Application
system	I-Application
to	O
be	O
used	O
in	O
production	O
.	O
</s>
<s>
MICRO	O
was	O
first	O
used	O
for	O
the	O
study	O
of	O
large	O
social	O
science	O
data	B-Application
bases	I-Application
referred	O
to	O
as	O
micro	O
data	O
;	O
hence	O
the	O
name	O
.	O
</s>
<s>
Organizations	O
such	O
as	O
the	O
US	O
Department	O
of	O
Labor	O
,	O
the	O
US	O
Environmental	O
Protection	O
Agency	O
,	O
and	O
researchers	O
from	O
the	O
University	O
of	O
Alberta	O
,	O
the	O
University	O
of	O
Michigan	O
,	O
Wayne	O
State	O
University	O
,	O
the	O
University	O
of	O
Newcastle	O
upon	O
Tyne	O
,	O
and	O
Durham	O
University	O
used	O
MICRO	O
to	O
manage	O
very	O
large	O
scale	O
databases	B-Application
until	O
1998	O
.	O
</s>
<s>
MICRO	O
runs	O
under	O
the	O
Michigan	B-Application
Terminal	I-Application
System	I-Application
(	O
MTS	O
)	O
,	O
the	O
interactive	O
time-sharing	O
system	O
developed	O
at	O
the	O
University	O
of	O
Michigan	O
that	O
runs	O
on	O
IBM	B-Device
System/360	I-Device
Model	I-Device
67	I-Device
,	O
System/370	B-Device
,	O
and	O
compatible	O
mainframe	O
computers	O
.	O
</s>
<s>
The	O
lower	O
level	O
routines	O
from	O
STIS	O
treat	O
the	O
data	B-Application
bases	I-Application
as	O
sets	O
and	O
perform	O
set	O
operations	O
on	O
them	O
,	O
e.g.	O
,	O
union	O
,	O
intersection	O
,	O
restrictions	O
,	O
etc	O
.	O
</s>
<s>
Although	O
the	O
underlying	O
STDS	O
model	O
is	O
based	O
on	O
set	O
theory	O
,	O
the	O
MICRO	O
user	O
interface	O
is	O
similar	O
to	O
those	O
subsequently	O
used	O
in	O
relational	B-Application
database	I-Application
management	I-Application
systems	I-Application
.	O
</s>
<s>
If	O
more	O
rigorous	O
statistical	O
analysis	O
are	O
desired	O
,	O
the	O
data	O
from	O
a	O
MICRO	O
database	O
can	O
be	O
exported	O
to	O
the	O
Michigan	O
Interactive	O
Data	O
Analysis	O
System	O
(	O
MIDAS	O
)	O
,	O
a	O
statistical	O
analysis	O
package	O
available	O
under	O
the	O
Michigan	B-Application
Terminal	I-Application
System	I-Application
.	O
</s>
