Crime is costly, and preventing repeat offending requires investment in rehabilitation and reintegration initiatives with demonstrated empirical support. A common criticism of the GLM is the lack of empirical support for GLM-derived interventions relative to the Risk Need and Responsivity (RNR) principles of effective correctional interventions. Applied appropriately, GLM-derived interventions adhere to each of the RNR principles, embedding them within a broader strengths-based practice framework. The aim of this chapter is to take stock of extant research and inspire ongoing research. This chapter begins by reviewing empirical research examining the GLM’s knowledge-related assumptions, followed by a review of nascent research on the effectiveness of GLM-informed correctional interventions. This chapter will highlight the burgeoning evidence supporting the GLM, alongside key gaps in the GLM’s evidence base. The popularity of the GLM alongside a new generation of GLM-aligned, strengths-based outcome measures provide the foundations necessary for furthering the GLM’s evidence base in the coming years.