Langford, Barry E.; Schoenfeld, Gerald; Izzo, George - In: Qualitative Market Research: An International Journal 5 (2002) 1, pp. 58-70
These empirical results provide new and strong support for Langford’s 1994 quantitative demonstration that the qualitative results of nominal grouping sessions (NGS) are highly reliable and valid. We also show that NGS produces responses in greater depth and breadth than many years of research...