<s>
ThingLab	B-Application
is	O
a	O
visual	B-Language
programming	I-Language
environment	B-Device
implemented	O
in	O
Smalltalk	B-Application
and	O
designed	O
at	O
Xerox	O
PARC	O
by	O
Alan	O
Borning	O
.	O
</s>
<s>
A	O
constraint-oriented	O
system	O
,	O
such	O
as	O
ThingLab	B-Application
,	O
allows	O
the	O
user	O
to	O
provide	O
arbitrary	O
inputs	O
or	O
outputs	O
,	O
then	O
solves	O
for	O
whatever	O
is	O
unknown	O
.	O
</s>
<s>
ThingLab	B-Application
is	O
viewed	O
as	O
one	O
of	O
the	O
earliest	O
constraint-oriented	O
systems	O
.	O
</s>
<s>
ThingLab	B-Application
is	O
credited	O
in	O
"	O
Fumbling	O
the	O
Future	O
"	O
as	O
a	O
big	O
reason	O
Xerox	O
continued	O
to	O
fund	O
computer	O
development	O
.	O
</s>
