PERU runs the Reducing Reoffending Website, which is assembling available evidence on what works to reduce re-offending in an accessible format. The site is in its early stages, but already provides overveiws of the evidence-base for a number of different approaches to reducing re-offending. Chris and Andrew will be drawing on the website to provide an overview of the current state of knowledge as well as discussing the challenges of building an evidence base, recognising that interventions and approaches to reduce re-offending are diverse and that the evidence comes in many different forms.