<s>
Ada	B-Language
Programming	I-Language
Support	O
Environment	O
or	O
APSE	B-Language
,	O
was	O
a	O
specification	O
for	O
a	O
programming	O
environment	O
to	O
support	O
software	O
development	O
in	O
the	O
Ada	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
This	O
represented	O
the	O
second	O
stage	O
of	O
the	O
U.S.	O
military	O
Ada	B-Language
project	O
;	O
once	O
the	O
language	O
was	O
implemented	O
,	O
it	O
was	O
felt	O
necessary	O
to	O
specify	O
and	O
implement	O
a	O
standard	O
set	O
of	O
tools	O
,	O
hence	O
the	O
APSE	B-Language
.	O
</s>
<s>
CAIS-A	B-Language
,	O
Common	O
APSE	B-Language
Interface	O
Set	O
A	O
,	O
was	O
defined	O
in	O
MIL	O
STD-1838A	O
.	O
</s>
<s>
CAIS	O
defines	O
a	O
set	O
of	O
Ada	B-Language
APIs	O
to	O
enable	O
portability	O
of	O
development	O
tools	O
across	O
operating	O
systems	O
.	O
</s>
<s>
As	O
of	O
1988	O
,	O
CAIS	O
implementations	O
were	O
developed	O
for	O
Unix	B-Application
,	O
VMS	B-Operating_System
and	O
IBM	O
MVS	B-Application
.	O
</s>
