<s>
PLaSM	B-Algorithm
(	O
Programming	O
Language	O
of	O
Solid	O
Modeling	O
)	O
is	O
an	O
open	O
source	O
scripting	B-Language
language	I-Language
for	O
solid	O
modeling	O
,	O
a	O
discipline	O
that	O
constitutes	O
the	O
foundation	O
of	O
computer-aided	B-Application
design	I-Application
and	O
CAD	B-Application
systems	O
.	O
</s>
<s>
In	O
contrast	O
to	O
other	O
CAD	B-Application
programs	I-Application
,	O
PLaSM	B-Algorithm
emphasizes	O
scripting	B-Language
rather	O
than	O
interactive	O
GUI	O
work	O
.	O
</s>
<s>
Users	O
can	O
create	O
arbitrarily	O
complex	O
designs	O
using	O
a	O
wide	O
range	O
of	O
simple	O
2D	O
and	O
3D	O
objects	O
,	O
advanced	O
curves	O
and	O
curved	O
surfaces	O
,	O
Boolean	O
operations	O
,	O
and	O
elementary	O
as	O
well	O
as	O
advanced	O
geometric	B-Algorithm
transformations	I-Algorithm
.	O
</s>
<s>
The	O
scripting	B-Language
approach	O
is	O
very	O
different	O
from	O
working	O
with	O
an	O
interactive	O
Graphical	O
User	O
Interface	O
(	O
GUI	O
)	O
.	O
</s>
<s>
Although	O
it	O
means	O
less	O
user	O
comfort	O
,	O
it	O
is	O
preferred	O
by	O
numerous	O
CAD	B-Application
instructors	O
as	O
scripts	O
reveal	O
all	O
details	O
of	O
the	O
design	O
procedure	O
(	O
not	O
only	O
the	O
final	O
design	O
)	O
and	O
students	O
are	O
exposed	O
to	O
elementary	O
computer	O
programming	O
.	O
</s>
<s>
PLaSM	B-Algorithm
has	O
been	O
developed	O
since	O
the	O
1980s	O
by	O
the	O
CAD	B-Application
group	O
at	O
the	O
Universities	O
Roma	O
Tre	O
and	O
La	O
Sapienza	O
in	O
Rome	O
,	O
Italy	O
,	O
by	O
Alberto	O
Paoluzzi	O
and	O
his	O
collaborators	O
.	O
</s>
