Few crimes are as complicated to investigate and understand as honour-based crimes.The planning and execution often involves multiple family members, usually without personality disorders or major mental disorders, and can include mothers, sisters, brothers, male cousins, uncles and grand- fathers whose actions are by many, themselves included, considered as good or necessary. Invest- igations often have to be carried out trans- national, involving many authorities and sometimes several countries. This paper describes the process of developing an evidence-based check- list which has been used for six years in Sweden
as an aid for law enforcement and social author- ities in cases with suspected risk for honour-based violence. Data from 56 recent cases are presented and discussed.