<s>
In	O
artificial	B-Application
intelligence	I-Application
and	O
computer	B-General_Concept
programming	I-General_Concept
,	O
state	B-Application
space	I-Application
planning	I-Application
is	O
a	O
process	O
used	O
in	O
designing	O
programs	O
to	O
search	O
for	O
data	O
or	O
solutions	O
to	O
problems	O
.	O
</s>
<s>
In	O
a	O
computer	O
algorithm	O
that	O
searches	O
a	O
data	B-General_Concept
structure	I-General_Concept
for	O
a	O
piece	O
of	O
data	O
,	O
for	O
example	O
a	O
program	O
that	O
looks	O
up	O
a	O
word	O
in	O
a	O
computer	O
dictionary	O
,	O
the	O
state	O
space	O
is	O
a	O
collective	O
term	O
for	O
all	O
the	O
data	O
to	O
be	O
searched	O
.	O
</s>
<s>
Similarly	O
,	O
artificial	B-Application
intelligence	I-Application
programs	I-Application
often	O
employ	O
a	O
process	O
of	O
searching	O
through	O
a	O
finite	O
universe	O
of	O
possible	O
procedures	O
for	O
reaching	O
a	O
goal	O
,	O
to	O
find	O
a	O
procedure	O
or	O
the	O
best	O
procedure	O
to	O
achieve	O
the	O
goal	O
.	O
</s>
<s>
State	B-Application
space	I-Application
planning	I-Application
is	O
the	O
process	O
of	O
deciding	O
which	O
parts	O
of	O
the	O
state	O
space	O
the	O
program	O
will	O
search	O
,	O
and	O
in	O
what	O
order	O
.	O
</s>
<s>
The	O
simplest	O
classical	O
planning	O
(	O
see	O
Automated	O
Planning	O
)	O
algorithms	O
are	O
state	B-Algorithm
space	I-Algorithm
search	I-Algorithm
algorithms	O
.	O
</s>
<s>
Forward	O
Search	O
and	O
Backward	O
Search	O
are	O
two	O
of	O
main	O
samples	O
of	O
state	B-Application
space	I-Application
planning	I-Application
.	O
</s>
