<s>
The	O
Constructive	O
Systems	O
Engineering	O
Cost	O
Model	O
(	O
COSYSMO	B-General_Concept
)	O
was	O
created	O
by	O
Ricardo	O
Valerdi	O
while	O
at	O
the	O
University	O
of	O
Southern	O
California	O
Center	O
for	O
Software	O
Engineering	O
.	O
</s>
<s>
Similar	O
to	O
its	O
predecessor	O
COCOMO	O
,	O
COSYSMO	B-General_Concept
computes	O
effort	O
(	O
and	O
cost	O
)	O
as	O
a	O
function	O
of	O
system	O
functional	O
size	O
and	O
adjusts	O
it	O
based	O
on	O
a	O
number	O
of	O
environmental	O
factors	O
related	O
to	O
systems	O
engineering	O
.	O
</s>
<s>
COSYSMO	B-General_Concept
's	O
central	O
cost	O
estimating	O
relationship	O
,	O
or	O
CER	O
is	O
of	O
the	O
form	O
:	O
</s>
