<s>
The	O
Lisa	O
project	O
is	O
a	O
platform	O
for	O
the	O
development	O
of	O
Lisp-based	B-Language
Intelligent	I-Language
Software	I-Language
Agents	I-Language
.	O
</s>
<s>
Lisa	O
is	O
a	O
production-rule	B-Application
system	I-Application
implemented	O
in	O
the	O
Common	B-Application
Lisp	I-Application
Object	I-Application
System	I-Application
(	O
CLOS	B-Application
)	O
,	O
and	O
is	O
heavily	O
influenced	O
by	O
CLIPS	B-Application
and	O
the	O
Java	B-Language
Expert	O
System	O
Shell	O
(	O
JESS	O
)	O
.	O
</s>
<s>
At	O
its	O
core	O
is	O
a	O
reasoning	O
engine	O
based	O
on	O
an	O
object-oriented	O
implementation	O
of	O
the	O
Rete	B-Algorithm
algorithm	I-Algorithm
,	O
a	O
very	O
efficient	O
mechanism	O
for	O
solving	O
the	O
difficult	O
many-to-many	O
matching	O
problem	O
.	O
</s>
<s>
Intrinsic	O
to	O
Lisa	O
is	O
the	O
ability	O
to	O
reason	O
over	O
CLOS	B-Application
objects	O
without	O
imposing	O
special	O
class	O
hierarchy	O
requirements	O
;	O
thus	O
it	O
should	O
be	O
possible	O
to	O
easily	O
augment	O
existing	O
CLOS	B-Application
applications	O
with	O
reasoning	O
capabilities	O
.	O
</s>
<s>
As	O
Lisa	O
is	O
an	O
extension	O
to	O
Common	B-Language
Lisp	I-Language
,	O
the	O
full	O
power	O
of	O
the	O
Lisp	B-Language
environment	O
is	O
always	O
available	O
.	O
</s>
<s>
Lisa-enabled	O
applications	O
should	O
run	O
on	O
any	O
ANSI-compliant	O
Common	B-Language
Lisp	I-Language
platform	O
.	O
</s>
