上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY How Many Customers？ 100 80 60 One-on-One Interviews(1 hour) Focus Groups(2 hours) 40 20 0 0 1234 5 67 8 9 10 Number of Respondents or Groups From:Griffin,Abbie and John R.Hauser."The Voice of the Customer", Marketing Science.vol.12,no.1,Winter 1993.How Many Customers? From: Griffin, Abbie and John R. Hauser. “The Voice of the Customer”, Marketing Science. vol. 12, no. 1, Winter 1993. One-on-One Interviews (1 hour) Focus Groups (2 hours) 0 1 2 3 4 5 6 7 8 9 10 0 20 40 60 80 100 Percent of Needs Identified Number of Respondents or Groups