<s>
An	O
instruction	B-General_Concept
step	I-General_Concept
is	O
a	O
method	O
of	O
executing	O
a	O
computer	B-Application
program	I-Application
one	O
step	O
at	O
a	O
time	O
to	O
determine	O
how	O
it	O
is	O
functioning	O
.	O
</s>
<s>
Program	B-Device
status	I-Device
word	I-Device
/	O
Memory	O
or	O
general	O
purpose	O
register	O
read-out	O
could	O
then	O
be	O
accomplished	O
by	O
observing	O
and	O
noting	O
the	O
console	O
lights	O
.	O
</s>
<s>
Instrumentation	B-Application
-	O
requiring	O
code	O
to	O
be	O
added	O
during	O
compile	B-Language
or	O
assembly	B-Language
to	O
achieve	O
statement	O
stepping	O
.	O
</s>
<s>
Code	O
can	O
be	O
added	O
manually	O
to	O
achieve	O
similar	O
results	O
in	O
interpretive	O
languages	O
such	O
as	O
JavaScript	B-Language
.	O
</s>
<s>
In	O
some	O
software	O
products	O
which	O
facilitate	O
debugging	O
of	O
High	B-Language
level	I-Language
languages	I-Language
,	O
it	O
is	O
possible	O
to	O
execute	O
an	O
entire	O
HLL	O
statement	O
at	O
a	O
time	O
.	O
</s>
<s>
This	O
requires	O
integration	O
with	O
the	O
compilation	B-Language
output	O
to	O
determine	O
the	O
scope	O
of	O
each	O
statement	O
.	O
</s>
<s>
Full	O
Instruction	B-Application
set	I-Application
simulators	I-Application
however	O
could	O
provide	O
instruction	O
stepping	O
with	O
or	O
without	O
any	O
source	O
,	O
since	O
they	O
operate	O
at	O
machine	O
code	O
level	O
,	O
optionally	O
providing	O
full	O
trace	O
and	O
debugging	O
information	O
to	O
whatever	O
higher	O
level	O
was	O
available	O
through	O
such	O
integration	O
.	O
</s>
<s>
In	O
addition	O
they	O
may	O
also	O
optionally	O
allow	O
stepping	O
through	O
each	O
assembly	B-Language
(	O
machine	O
)	O
instruction	O
generated	O
by	O
a	O
HLL	O
statement	O
.	O
</s>
<s>
Programs	O
composed	O
of	O
multiple	O
'	O
modules	O
 '	O
compiled	B-Language
from	O
a	O
mixture	O
of	O
compiled	B-Language
languages	O
,	O
and	O
even	O
instructions	O
created	O
"	O
on-the-fly	O
"	O
in	O
dynamically	O
allocated	O
memory	O
,	O
could	O
be	O
accommodated	O
using	O
this	O
technique	O
.	O
</s>
