The introduction of a paper questionnaire was a milestone in market research. Where previously high personnel and time costs had to be invested in conducting face-to-face interviews, the paper-pencil method offered significantly higher efficiency: The answer options could be standardised and thus made comparable – and the processing effort was completely transferred to the respondent, at least for the time required to complete the form. The influence of the interviewer, which no longer existed, led to a better observation of anonymity. This ensured that even questions of a sensitive nature were answered more readily. And finally, the wide radius of distribution by standard mail was trend-setting.


