Immigration systems are complicated, and they differ from one country to another, making it necessary to have assistance from a professional with the right expertise; hence, the use of visa services.
Whether it is an adviser or lawyer, an immigration professional can make it easy to understand how certain systems work. One type of system that you may come across is the point-based one, which is used in Australia and Canada.
The UK also has the 5-tier program that classifies visas for migrants who are not part of the European Economic Area (EEA). It is not clear, though, if a point-based system will be used after the UK exits the European Union.
http://www.visacompare.com/blog/understanding-the-visa-application-process-under-a-points-based-system
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