This chapter will explore the gaps and patterns in the prevalence of sexual violence/abuse data. The data sources for this information will be examined with an overview of the settings and organisations and processes in which it might be collated. Problems with conflation of population types (child sexual abuse, domestic violence and sexual violence and abuse) will be clarified. The meaning of the patterns shown will be framed in terms of gender and social inequality and then extended to address how sexual violence can be seen as a functional delivery mechanism for marginalisation. The gaps in reporting are fundamental to our flawed understanding of victimisation and perpetration and therefore a crucial step is to improve reporting. This will be related to compounding of harm through silence and an ongoing unmet need that we understand can become cyclical. The first step to improving data will be set out in terms of reviewing the literature around both barriers to, and what helps, reporting. This literature will scaffold a section on the evidence base around what works to improve reporting through a theoretical treatment of disclosure as a process vs an incident within a socio-ecological frame. Finally, a framework for addressing disclosure in an organisational- or settings-based approach will be described to summarise a whole organisation strategy.