Representing the second instalment of ISD’s Women and Extremism (WaE) programme, this report explores the phenomenon of Western women travelling to Syria and Iraq in support of ISIS. It first elaborates upon the motivations for these women and girls to migrate, explores some of the diverse range of profiles that have been monitored, and clarifies the role that they are likely to encompass once arriving in ISIS-held territory. Additionally, the report aims to elucidate how current government prevention and de-radicalisation infrastructure may be adapted to deal with this trend.