For example, in order for respondents to be asked questions about intimate partner violence that are relevant to their particular situation, they must first be asked whether they currently have an intimate partner and whether in the past they have had an intimate partners with whom they are no longer involved. The format and design of the questionnaire will also depend on the mode of interviewing and method of data capture. In paper questionnaires, skip instructions and filter questions must be simple enough for interviewers to follow them without error and without causing long delays in the interview. In computer-assisted questionnaires, there is no limit to the number of skip instructions or filter questions that can be included because they are programmed into the computer program in advance and therefore allow interviewers to move through the questionnaire smoothly and accurately. However, excessive use of filter questions nested within other filter questions can cause confusion to data analysts when they attempt to convey the survey results in clear, straightforward messages and may yield results that are unusable owing to the fact that multiple filters have resulted in very small sample counts. Filter questions should therefore be used only as necessary.