As tests Low (1991) argues that tests are constructed according to particular canons of validity, reliability, lack of redundancy and repetition, and independence of items. Designing a questionnaire along those lines produces indeed a familiar kind of document with short and simple questions, no irrelevant information, as little as possible interaction on paper with the researcher, or often little explanation for the presence of certain questions, few verbal links, and little structure even in terms of divisions into thematic sections. It should not be possible for the answer to one question to be dependent on the respondent being able to answer another question, nor for one question to suggest he answer to another. Questionnaires are often evaluated like tests - the same technology for automatic score reading can be used, the same statistical methods may be invoked.