Insufficiently structured questionnaire
We refer to the description of the questionnaire in certain software (e.g. 1KA), which does not have direct consequences to the respondent or data quality, but can significantly improve the questionnaire design process.
In the case of longer questionnaires (e.g., more than 50 entries), it is sensible to group the questions into groups (blocks) or conditions based on their content and also name those groups accordingly (eg introductory block, block of questions for men, block of questions for women, demography).
When dealing with complex questionnaires, this makes question editing a lot easier and also makes the questionnaire more transparent.