In addition to marriage and membership statistics, surveys are also conducted by the SDU from time to time to assess the effectiveness of the SDU, and its public education objective in particular. In mid 2006, 2,041 university undergraduates and polytechnic students were polled in an SDU survey on undergraduates' attitudes towards social interaction, dating and marriage. The data, which was collected during a series of face-to-face interviews, showed that, while nine out of ten would like to get married, only 35 per cent of them were certain about their intentions.