<s>
The	O
Public	B-Application
Sector	I-Application
Credit	I-Application
Framework	I-Application
is	O
an	O
open	O
source	O
tool	O
for	O
estimating	O
the	O
default	O
risk	O
of	O
and	O
assigning	O
ratings	O
to	O
government	O
debt	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
,	O
source	O
code	O
was	O
published	O
on	O
GitHub	B-Application
.	O
</s>
<s>
The	O
simulation	O
is	O
typically	O
created	O
in	O
an	O
Excel	B-Application
worksheet	O
.	O
</s>
<s>
The	O
framework	O
combines	O
a	O
user	O
interface	O
written	O
in	O
Microsoft	B-Application
Excel	I-Application
with	O
a	O
processing	O
engine	O
written	O
in	O
GNU	B-Operating_System
C	O
.	O
Developers	O
have	O
expressed	O
an	O
intention	O
to	O
support	O
a	O
full	O
open	O
source	O
run-time	O
environment	O
.	O
</s>
<s>
According	O
to	O
PSCF	O
's	O
creators	O
,	O
Excel	B-Application
was	O
chosen	O
as	O
the	O
initial	O
user	O
interface	O
platform	O
because	O
of	O
its	O
popularity	O
in	O
the	O
financial	O
community	O
.	O
</s>
<s>
The	O
PSCF	O
user	O
enters	O
model	O
parameters	O
in	O
Excel	B-Application
and	O
then	O
launches	O
a	O
control	O
panel	O
implemented	O
in	O
Excel	B-Application
VBA	O
.	O
</s>
<s>
Outputs	O
from	O
the	O
C	O
program	O
are	O
returned	O
to	O
new	O
tabs	O
in	O
the	O
Excel	B-Application
workbook	O
.	O
</s>
