Immigration Policy in Canada
Define the main terms you are going to use. You need to establish the ground rules that define what you are explaining. If you are investigating the role of ethnicity in civil wars, what do you mean by ethnicity, and what is a civil war? If you are focusing on how NGOs fight corruption, what do you mean by corruption?
In our case, some of the terms you must define are: for example, immigration policy making
Readers do not need to know every source you read. They just need a general sense of any debates, and the reasons you think your definitions are best.