“…They are considered an important and effective means of presenting clear standards for consumers, supporting service development, signalling quality, increasing quality perception, reducing perceived risk, decreasing the perceived likelihood of service failure, attracting and retaining customers, enhancing customer satisfaction, increasing purchase intentions, encouraging positive word-of-mouth recommendations, and gaining market share through differentiation (Boulding & Kirmani, 1993;Evans, Clark, & Knutson, 1996;Hart, 1988;Hart et al, 1992;Hill, Hays, & Naveh, 2000;Kashyap, 2001;Kirmani & Rao, 2000;Lidén & Sandén, 2004;McDougall et al, 1998;Ostrom & Iacobucci, 1998;Tucci & Talaga, 1997;Wirtz & Kum, 2001;Wirtz et al, 2000). Numerous studies also have demonstrated that the provision of a service guarantee improves the expected service quality, reduces perceived risk, and increases the willingness to buy (Boshoff, 2003;Ostrom & Iacobucci, 1998;Wirtz et al, 2000).…”