<s>
Betty	B-Application
's	I-Application
Brain	I-Application
is	O
a	O
software	O
environment	O
created	O
at	O
Vanderbilt	O
University	O
by	O
the	O
Teachable	B-Application
Agents	I-Application
Group	O
to	O
help	O
promote	O
students	O
 '	O
understanding	O
of	O
metacognitive	O
skills	O
and	O
to	O
reinforce	O
river	O
ecosystem	O
knowledge	O
as	O
part	O
of	O
a	O
science	O
curriculum	O
.	O
</s>
<s>
In	O
this	O
way	O
Betty	B-Application
's	I-Application
Brain	I-Application
diverges	O
from	O
a	O
classic	O
intelligent	O
tutoring	O
system	O
(	O
ITS	O
)	O
and	O
adopts	O
the	O
learning	O
by	O
teaching	O
(	O
LBT	O
)	O
paradigm	O
where	O
computer	O
agent	O
interactions	O
are	O
focused	O
around	O
completing	O
a	O
primary	O
task	O
unrelated	O
to	O
the	O
acquisition	O
of	O
domain	O
content	O
knowledge	O
.	O
</s>
<s>
More	O
recently	O
,	O
Betty	O
's	O
level	O
of	O
artificial	B-Application
intelligence	I-Application
has	O
been	O
largely	O
modified	O
to	O
increase	O
the	O
interactivity	O
with	O
the	O
students	O
.	O
</s>
<s>
In	O
both	O
activities	O
,	O
the	O
systems	O
were	O
presented	O
with	O
resources	O
and	O
the	O
modeling	B-Language
language	I-Language
was	O
the	O
qualitative	O
diagram	O
language	O
built	O
into	O
the	O
system	O
.	O
</s>
