An open-ended question is a question that cannot be answered by pre-established answer proposals. Respondent is completely free in his answer and can express himself with his own words.
Open-ended questions involve a more difficult data processing, with the exception of numerical question type.Moreover researchers face codification and interpretation difficulties.
Open-ended questions are often used in qualitative studies, rond-tables and interviews.
Information captured is not structured and express deep consumer thinking about the subject.
Many open-ended questions may reveal a lack of preparation of the questionnaire and a lack of precision of the objectives.
Generally, respondents neglect their answers and pay little attention to open-ended questions.