Final answer:
Questionnaires should be focused, avoid unfamiliar jargon, have a logical sequence, and be prepared primarily by research professionals to efficiently gather useful information.
Step-by-step explanation:
Questionnaires used for primary research should be carefully designed to gather useful information efficiently. They should not address too many issues at once; instead, they should be focused on gathering specific information pertinent to the study.
It's important for the questionnaire to avoid using jargon that might not be familiar to the respondents, as this could lead to confusion or misinterpretation of questions. Questions should be sequenced in a way that follows a logical order, often starting with more general inquiries and moving toward more specific ones.