what are the five basic principles for designing a good questionnaire?
['Be comprehensible! Use a clear and comprehensible language to ease the cognitive burden for the respondents. ... ', 'Be clear! It sounds obvious, but questions need to be clear and unambiguous. ... ', 'Be neutral! Avoid suggestive questions or unbalanced answering options. ... ', 'Operationalize! ... ', 'Mind the order!']