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Evacuation is commonly used to mitigate the ill effects of a variety of disaster agents. It is important that authorities gain an accurate understanding of the circumstances under which citizens will evacuate. Tests the efficacy of evacuation message clarity and frequency, authority type, the accuracy of past warnings, and the impact of the presence of children in the home as viable variables in effecting an evacuation response. Finds the evacuation response was more likely to occur if the potential victim was ordered to do so, if the potential victim was contacted frequently (more than once) by the proper authority (as perceived by the potential victim), if past warnings were perceived as being accurate, and dependent children were in the home. Interviews respondents from 83 households in Ephrata, Pennsylvania, USA, after a major fire emergency threatened residents of three neighbourhoods contiguous to the site.