I have understood that this is a research method. How many types are there?

I would like to know what are the techniques (in case of method) and instruments.

And how would you characterize it in the type of investigation?

I would also like you to cite me, which are the brackets of each instrument? For example, the questionnaire is an instrument of the technique called "survey" and the tangible bracket of this instrument is the paper printed with the bank of questions.

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