This distinguishes bullying from isolated behaviours and other forms of job stress and allows the term workplace bullying to be applied in various contexts and to behaviours that meet these characteristics. Many observers agree that bullying is often a repetitive behaviour. However, some experts who have dealt with a great many people who report abuse also categorize some once-only events as bullying, for example with cases where there appear to be severe sequelae. Expanding the common understanding of bullying to include single, severe episodes also parallels the legal definitions of sexual harassment in the US.