Frisch explains that 'a Shared Authority suggests something that is' that in the nature of oral and public history, we are not the sole interpreters. The presence of multiple voices from community and individual partners is an alternative to unquestioned official histories and helps empower people, especially underrepresented minorities. Tyson explains that The Staff Administrative Handbook informed trainees at Historic Fort Snelling that feelings and attitudes and facial expressions are highly communicable to the visitor. James Oliver Horton interviewed interpreters who participated in the 1994 controversial 'Estate Sale' program arranged at Colonial Williamsburg (CW), whose aim was to re-enact a slave auction. In Northern Ireland, the ethnic divisions between Catholic Nationalists and Protestant Unionists led to different choices about what part of the past should be remembered.