Questionnaire construction is presented by Prakash Aryal. Questionnaires can be used for primary research and involve asking respondents questions either in person or through mail/online surveys. Key steps in constructing a questionnaire include determining the type of survey, developing questions, organizing the question sequence and layout, and pilot testing. Questions should avoid ambiguity, bias, and double meanings. Both open-ended and closed-ended questions can be used, with closed-ended questions being easier to analyze but potentially limiting responses. The order and format of questions is also important to make the questionnaire smooth, logical and easy for respondents to follow.