A method, apparatus and computer software for automatically analysing a filled in questionnaire, are provided. The method includes automatically analysing a filled in questionnaire, the method comprising the steps of: providing a questionnaire having answer locations; scanning at least two copies of the questionnaire with the answer locations filled in differently and complementarily in a predetermined way, to produce a first scan and a second scan; automatically determining answer locations by comparing the first and second scans; providing a filled in questionnaire having certain answers; scanning the provided filled in questionnaire as a third scan; and automatically judging the certain answers with the determined answer locations.