Computer-assisted programs can handle long and complicated questionnaires of practically any length and can also accommodate very large samples. They can also be personalised or seem to act in an intelligent manner. In the latter respect, answers from previous questions can be inserted automatically into the text of later questions. For instance, a questionnaire about computers may ask about whether the respondent has used any particular makes recently and ask him or her to name the makes. A later portion of the questionnaire may probe into each such computer experience and the program can be structured so that the name of each computer tried is inserted automatically into the questionnaire at the right point. Another useful feature is that the replies to an open-ended question are available to an interviewer for later access, if required. Any interview temporarily terminated at the respondent's request, for instance a telephone interview, can be rescheduled for completion at a later time.
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