<s>
Delta	B-General_Concept
Debugging	I-General_Concept
is	O
a	O
methodology	O
to	O
automate	O
the	O
debugging	O
of	O
programs	O
using	O
a	O
scientific	O
approach	O
of	O
hypothesis-trial-result	O
loop	O
.	O
</s>
<s>
In	O
practice	O
,	O
the	O
Delta	B-General_Concept
Debugging	I-General_Concept
algorithm	O
builds	O
on	O
unit	O
testing	O
to	O
isolate	O
failure	O
causes	O
automatically	O
-	O
by	O
systematically	O
narrowing	O
down	O
failure-inducing	O
circumstances	O
until	O
a	O
minimal	O
set	O
remains	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
you	O
can	O
supply	O
a	O
test	O
case	O
that	O
will	O
produce	O
the	O
bug	O
you	O
are	O
looking	O
for	O
,	O
then	O
you	O
can	O
feed	O
that	O
to	O
the	O
Delta	B-General_Concept
Debugging	I-General_Concept
algorithm	O
,	O
which	O
will	O
then	O
simply	O
try	O
to	O
trim	O
useless	O
functions	O
and	O
lines	O
of	O
code	O
that	O
are	O
not	O
needed	O
to	O
reproduce	O
the	O
bug	O
,	O
until	O
a	O
1-minimal	O
program	O
is	O
found	O
.	O
</s>
<s>
Delta	B-General_Concept
Debugging	I-General_Concept
has	O
been	O
applied	O
to	O
isolate	O
failure-inducing	O
program	O
input	O
(	O
e.g.	O
</s>
<s>
Later	O
,	O
some	O
software	O
development	O
tools	O
have	O
been	O
inspired	O
by	O
Delta	B-General_Concept
Debugging	I-General_Concept
,	O
such	O
as	O
the	O
bisect	B-Protocol
commands	I-Protocol
of	O
revision	B-Architecture
control	I-Architecture
systems	I-Architecture
(	O
e.g.	O
,	O
git-bisect	O
,	O
svn-bisect	O
,	O
hg-bisect	O
,	O
etc	O
.	O
</s>
<s>
)	O
,	O
which	O
,	O
instead	O
of	O
working	O
on	O
the	O
program	O
's	O
code	O
,	O
apply	O
the	O
delta	B-General_Concept
debugging	I-General_Concept
methodology	O
on	O
the	O
code	O
history	O
by	O
comparing	O
various	O
versions	O
until	O
the	O
faulty	O
change	O
is	O
found	O
.	O
</s>
<s>
-	O
a	O
language-agnostic	O
reducer	O
for	O
program	O
minimization	O
,	O
which	O
employs	O
Delta	B-General_Concept
debugging	I-General_Concept
algorithm	O
.	O
</s>
