“…In the latter case, Turoff (1970: 153) suggests 'anywhere from ten to fi fty people', while most studies use panels of 15 to 35 individuals (Gordon, 1994;Rowe and Wright, 1999;Miller, 2001b). The literature contains examples and suggestions for panels comprised of hundreds (Mullen, 2003) to thousands of participants (Linstone, 1978;Cantrill et al, 1996;Jung-Erceg et al, 2007). A scan of the tourism literature reveals published studies with Delphi panel sizes in the following ranges: twenty or less (Lloyd et al, 2000;Weber and Ladkin, 2003;Kuo and Chiu, 2006;Tsaur et al, 2006;), 20 to 50 (Liu, 1988;Yeong et al, 1989;Green et al, 1990aGreen et al, , 1990bO'Connor and Frew, 2004;Choi and Sirakaya, 2006), 50 to 70 (Miller, 2001b;Briedenhann and Butts, 2006;Kaynak and Marandu, 2006), 70 to 100 (Kaynak and Macauley, 1985;Spenceley, 2003); and 100 or more (Kaynak et al, 1994).…”