To stimulate discussion on formative referents, focus group participants were given a list of major historical events and social and technological changes that occurred during the formative years of each generation. Working from this list, participants reminisced with each other about their shared memories of growing up during a particular historical era, reflecting on episodic memories of the major historical events that occurred during their formative years. For instance, Baby Boomer participants recalled the assassination of the U.S. president John Kennedy, Generation X participants recalled the collapse of the Berlin Wall and the death of Princess Diana, and Generation Y participants recalled the New York terrorism attacks of September 11, 2001. However, these events had little influence on their long-term or present-day travel attitude. As an illustration of the temporary influence of macro events, below a Generation Y focus group participant discusses the terrorist attacks on New York on September 11, 2001 as well as the London tube bombings and how they affected her attitude and behavior when visiting these destinations after these events: