<s>
A	O
white	B-General_Concept
box	I-General_Concept
(	O
or	O
glass	B-General_Concept
box	I-General_Concept
,	O
clear	O
box	O
,	O
or	O
open	B-General_Concept
box	I-General_Concept
)	O
is	O
a	O
subsystem	O
whose	O
internals	O
can	O
be	O
viewed	O
but	O
usually	O
not	O
altered	O
.	O
</s>
<s>
The	O
term	O
is	O
used	O
in	O
systems	O
engineering	O
,	O
software	B-General_Concept
engineering	I-General_Concept
,	O
and	O
in	O
intelligent	B-Application
user	I-Application
interface	I-Application
design	O
,	O
where	O
it	O
is	O
closely	O
related	O
to	O
recent	O
interest	O
in	O
explainable	O
artificial	O
intelligence	O
.	O
</s>
<s>
The	O
notion	O
of	O
a	O
"	O
Black	B-Device
Box	I-Device
in	O
a	O
Glass	B-General_Concept
Box	I-General_Concept
"	O
was	O
originally	O
used	O
as	O
a	O
metaphor	O
for	O
teaching	O
complex	O
topics	O
to	O
computing	O
novices	O
.	O
</s>
