<s>
Fork	B-Application
and	I-Application
pull	I-Application
model	I-Application
refers	O
to	O
a	O
software	O
development	O
model	O
mostly	O
used	O
on	O
GitHub	B-Application
,	O
where	O
multiple	O
developers	O
working	O
on	O
an	O
open	O
,	O
shared	O
project	O
make	O
their	O
own	O
contributions	O
by	O
sharing	O
a	O
main	O
repository	O
and	O
pushing	O
changes	O
after	O
granted	O
pull	O
request	O
by	O
integrator	O
users	O
.	O
</s>
<s>
Followed	O
by	O
the	O
advent	O
of	O
distributed	B-Protocol
version	I-Protocol
control	I-Protocol
systems	I-Protocol
(	O
DVCS	O
)	O
,	O
Git	O
naturally	O
enables	O
the	O
usage	O
of	O
a	O
pull-based	O
development	O
model	O
,	O
in	O
which	O
developers	O
can	O
copy	O
the	O
project	O
onto	O
their	O
own	O
repository	O
and	O
then	O
push	O
their	O
changes	O
to	O
the	O
original	O
repository	O
,	O
where	O
the	O
integrators	O
will	O
determine	O
the	O
validity	O
of	O
the	O
pull	O
request	O
.	O
</s>
<s>
On	O
GitHub	B-Application
,	O
over	O
400,000	O
pull-requests	O
emerged	O
per	O
month	O
on	O
average	O
in	O
2015	O
.	O
</s>
<s>
It	O
is	O
also	O
the	O
model	O
shared	O
on	O
most	O
collaborative	O
coding	O
platforms	O
,	O
like	O
Bitbucket	B-Protocol
,	O
Gitorious	B-Application
,	O
etc	O
.	O
</s>
