The rape and murder of Kitty Genovese in 1964 which was allegedly* witnessed by 38 people who did not respond to her cries for help, sparked a great deal of research into the behaviour of bystanders (http://www2.selu.edu/Academics/Faculty/scraig/gansberg.html). Bibb Latane and John Darley were particularly interested in the case; their investigations led to several factors that they believe affect bystander behaviour: