<s>
It	O
is	O
based	O
on	O
hierarchical	O
decomposition	B-Algorithm
of	O
a	O
software	O
problem	O
.	O
</s>
<s>
HOOD	O
was	O
initially	O
created	O
for	O
the	O
European	O
Space	O
Agency	O
and	O
is	O
used	O
in	O
such	O
varied	O
domains	O
as	O
aerospace	O
(	O
Eurofighter	B-Application
Typhoon	I-Application
,	O
Helios	O
2	O
Earth	O
Observation	O
ground	O
control	O
,	O
Ariane	O
5	O
on-board	O
computer	O
)	O
,	O
ground	O
transportation	O
,	O
and	O
nuclear	O
plants	O
.	O
</s>
<s>
HOOD	O
main	O
target	O
languages	O
are	O
Ada	B-Language
,	O
Fortran	B-Application
and	O
C	B-Language
.	O
</s>
