Fire　safety　provisions　have　to　be　determined　through　performance-based　design　in　many　projects.　There　is　a　need　for　quick　estimation　of　evacuation　time　for　scenario　analysis　in　hazard　assessment.　The　key　equations　on　estimating　evacuation　time　have　to　be　better　understood.　An　updated　review　on　emergency　evacuation　will　be　presented　in　this　article.　Review　started　from　the　earlier　works　based　on　hydraulic　flow　models.　Three　key　parameters　on　crowd　density,　movement　speed,　and　flow　rate　are　outlined.　Design　values　recommended　in　those　calculation　procedures　are　summarized　in　a　table　and　several　graphs　for　horizontal　movement,　up　and　down　stairs.　©　2007,　Baywood　Publishing　Co.,　Inc.