They are different assignments writing methods in every country. Each country put its own standard for writing assignments. Students those are studying in these countries, they have to follow these standards to complete their assignments. If they will not follow then assignments are not considered as valid and they can lose their marks in exams. But students those are new in those countries they need to understand the standards for assignments. Here is one good resource which helps the students to understand the standard and outline for the assignments. That is http://essaywritingexpert-usa.tumblr.com/, it helps to write assignments in native languages.