<s>
The	O
Assertion	B-Language
Definition	I-Language
Language	I-Language
(	O
ADL	O
)	O
is	O
a	O
specification	B-Application
language	I-Application
providing	O
a	O
formal	O
grammar	O
to	O
specify	O
behaviour	O
and	O
interfaces	O
for	O
computer	O
software	O
.	O
</s>
<s>
ADL	O
uses	O
function	O
pre	O
-	O
and	O
postconditions	O
to	O
specify	O
interfaces	O
and	O
is	O
designed	O
to	O
provide	O
an	O
intermediary	O
between	O
informal	O
English	O
language	O
specifications	B-Application
and	O
formal	O
programmatic	O
test	O
specifications	B-Application
.	O
</s>
<s>
Tool	O
support	O
exists	O
both	O
to	O
convert	O
ADL	O
specifications	B-Application
into	O
natural	O
language	O
,	O
and	O
to	O
generate	O
test	O
systems	O
against	O
which	O
implementation	O
code	O
can	O
be	O
verified	O
.	O
</s>
