So the partners both sellers and buyers are aware of the scope, responsibilities, obligations and risks. By helping the two sides that the cultural differences are understood by all with 1 format.
The partners, both buyers and sellers responsibility to costs and risks. By helping the two sides are cultural differences are understood by all 13 forms.
So the partners both buyers and sellers know the scope of responsibility cost burden and risk. By allowing both sides with different cultural understanding by all 13 models.