Pytanie o częstotliwość powinno wskazywać konkretny okres, inaczej odpowiedź „często” może odnosić się do różnych przedziałów czasu.

We should distinguish what the data supports from what we merely assume.

Such a limited sample cannot support general conclusions.

This reasoning overlooks an alternative explanation for the observed phenomenon.

Let us not combine assessments of content and organisation in one question if we later want to identify which of them needs improvement.

An unmarked answer is not automatically a negative answer; the participant may have skipped the question for another reason.

An option to select 'not applicable' allows us to distinguish a lack of experience with a service from dissatisfaction with it.

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