The evidence is the details offered to support the judgment.If your judgment is that a particular restaurant does not consistently offer quality food, you need to support this with a variety of evidence to show how the judgment was reached.
In way it would be better if you avoid any topic that you feel strongly about.
You will have more things to say but your stand may cloud the objectivity of the paper and that is something that you do not wish to do.
Criteria (the plural of criterion) means establishing what the ideal for the product, place or service should be.
It means demonstrating what one should expect as the ideal outcome, Having clear criteria keeps an evaluation from seeming like an opinion.
Instead, the evaluation should seem reasoned and unbiased.
The key to making this happen, and therefore the key to a good investigative essay, is establishing clear and fair criteria, judgments and evidence.
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It tends to reveal the goodness and badness of something.
The prospect becomes challenging when you pick a very controversial topic where there is no clear winning point.
This kind of controversial topic makes for great writing experience and you will come out more experience at the end of the process.