A/HRC/7/6 page 17 59. Although further discussion will be needed to refine this concept, some broad parameters the grave violence against women indicator could cover are: • Any incident of rape/serious sexual assault/sexual coercion24 in childhood or adulthood, female genital mutilation, child/forced marriage, trafficking and sexual exploitation • With respect to the course of conduct offences, intimate partner violence, stalking, sexual harassment inclusion would be on the basis of seriousness and/or frequency, building on the analytic definitions developed in the studies conducted in Ireland and Finland25 60. The basic outcome indictors are: • Proportion of female population who have experienced grave violence in the past 12 months (based on a population survey) • Proportion of female population who have ever experienced grave violence (based on a population survey) 61. This proposal is made to facilitate progress, and draws on the model we have seen work with respect to female genital mutilation. It was agreement on international definitions which enabled research, policy development and indicators to proceed in a cooperative way. 62. Bearing in mind the availability of data, a system of layered compliance is envisaged. Layer 1 would comprise intimate partner violence, rape and sexual assault and female genital mutilation - the most common current measures. Subsequent layers would add in forms that are less often measured: harmful marriage practices; sexual harassment and stalking; trafficking and sexual exploitation; and sexual abuse of girls. 63. States are expected to move towards increased measurement of all forms of violence against women in order to produce accurate rates of grave violence for international comparison. Whether they do this through regular (five-yearly) specialist surveys or more frequently administered modules is a local decision. 2. Femicide indicator 64. The gravest form of violence against women is murder, which is not captured by prevalence methodology. Homicide data are among the most accurate of criminal justice statistics, though in many countries there are no reliable official statistics. There are a number of 24 This term is used in some national legal codes and makes reference to the International Criminal Court’s Elements of Crimes (Elements of the Crimes, article 8 (2) (b) (xxii)-1), to be read in relation to the Rome Statute, article 7 - Crimes against humanity - (1) (g) (rape). 25 Watson, D. & Parsons, S. (2005), Domestic Abuse of Women and Men in Ireland, National Crime Council; Piispa, M. (2002), The Complexity of Patterns of Violence Against Women in Heterosexual Partnerships, Violence Against Women, vol. 8, No. 7: 873-900.