<s>
Exploratory	B-Application
programming	I-Application
,	O
as	O
opposed	O
to	O
implementation	O
(	O
programming	O
)	O
,	O
is	O
an	O
important	O
part	O
of	O
the	O
software	B-General_Concept
engineering	I-General_Concept
cycle	O
:	O
when	O
a	O
domain	O
is	O
not	O
very	O
well	O
understood	O
or	O
open-ended	O
,	O
or	O
it	O
's	O
not	O
clear	O
what	O
algorithms	O
and	O
data	O
structures	O
might	O
be	O
needed	O
for	O
an	O
implementation	O
,	O
it	O
's	O
useful	O
to	O
be	O
able	O
to	O
interactively	O
develop	O
and	O
debug	O
a	O
program	O
without	O
having	O
to	O
go	O
through	O
the	O
usual	O
constraints	O
of	O
the	O
edit-compile-run-debug	O
cycle	O
.	O
</s>
<s>
Languages	O
such	O
as	O
APL	B-Language
,	O
Cecil	B-Language
,	O
C#	B-Application
,	O
Dylan	B-Language
,	O
Factor	B-Application
,	O
Forth	B-Application
,	O
F#	B-Operating_System
,	O
J	B-Language
,	O
Java	B-Language
,	O
Julia	B-Application
,	O
Lisp	B-Language
,	O
Mathematica	B-Language
,	O
Obliq	B-Language
,	O
Oz	B-Language
,	O
Prolog	B-Language
,	O
Python	B-Language
,	O
REBOL	B-Application
,	O
Perl	B-Language
,	O
R	B-Language
,	O
Ruby	B-Language
,	O
Scala	B-Application
,	O
Self	B-Operating_System
,	O
Smalltalk	B-Application
,	O
Tcl	B-Operating_System
,	O
and	O
JavaScript	B-Language
,	O
often	O
in	O
conjunction	O
with	O
an	O
IDE	B-Application
,	O
provide	O
support	O
for	O
exploratory	B-Application
programming	I-Application
via	O
interactivity	O
,	O
dynamicity	O
,	O
and	O
extensibility	O
.	O
</s>
<s>
For	O
some	O
software	O
development	O
projects	O
,	O
it	O
makes	O
sense	O
to	O
do	O
a	O
requirements	O
analysis	O
and	O
a	O
formal	B-Application
specification	I-Application
.	O
</s>
<s>
For	O
other	O
software	O
development	O
projects	O
,	O
it	O
makes	O
sense	O
to	O
let	O
the	O
developers	O
experiment	O
with	O
the	O
technology	O
and	O
let	O
the	O
specification	B-Application
of	O
the	O
software	O
evolve	O
depending	O
upon	O
the	O
exploratory	B-Application
programming	I-Application
.	O
</s>
