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While reviewing the different types of extended essays one can do in physics, or for that matter, any Group 4 subject, I came across one type of essay, called a survey, which involves comparing two models of a particular physical phenomenon. I wanted to know how exactly does one "compare" two theories. 

For example, my extended essay is on the Mpemba Effect, and I have gone through a few papers regarding the same topic. Do I compare and analyse data from each of those papers, or do I conduct my own experiments while referring to the experimental data in those papers?

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