In questionnaires and interviews, questions can either be open or closed. Open questions do not limit the possible answers that the responder can give, producing qualitative data, which is generally considered to be higher in validity. This is because it can be detailed and the respondent can give their own views, rather than be limited by the assumptions of the researcher. However, such data can be very difficult to analyse. There is also the danger that options are simply limited during analysis rather than design (I.e. the researcher puts the wide range of responses into a smaller number of categories in order to analyse them). This depends on the researcher's interpretation of the respondent's response which could be affected by subjectivity or the researcher's values.