<s>
A	O
spatial	B-Application
decision	I-Application
support	I-Application
system	I-Application
(	O
SDSS	O
)	O
is	O
an	O
interactive	O
,	O
computer-based	O
system	O
designed	O
to	O
assist	O
in	O
decision	O
making	O
while	O
solving	O
a	O
semi-structured	O
spatial	O
problem	O
.	O
</s>
<s>
An	O
SDSS	O
is	O
sometimes	O
referred	O
to	O
as	O
a	O
policy	O
support	O
system	O
,	O
and	O
comprises	O
a	O
decision	B-Application
support	I-Application
system	I-Application
(	O
DSS	O
)	O
and	O
a	O
geographic	B-Application
information	I-Application
system	I-Application
(	O
GIS	B-Application
)	O
.	O
</s>
<s>
This	O
entails	O
use	O
of	O
a	O
database	B-Application
management	I-Application
system	I-Application
(	O
DBMS	O
)	O
,	O
which	O
holds	O
and	O
handles	O
the	O
geographical	O
data	O
;	O
a	O
library	O
of	O
potential	O
models	O
that	O
can	O
be	O
used	O
to	O
forecast	O
the	O
possible	O
outcomes	O
of	O
decisions	O
;	O
and	O
an	O
interface	O
to	O
aid	O
the	O
users	O
interaction	O
with	O
the	O
computer	O
system	O
and	O
to	O
assist	O
in	O
analysis	O
of	O
outcomes	O
.	O
</s>
