INTRODUCTION
An estimated 3.8% of the world's prison population is HIV positive [With assisted partner notification (APN), health workers are trained to encourage and assist people diagnosed with HIV to inform their at‐risk partners of possible HIV exposure and the need for HIV testing. Research demonstrating APN's effectiveness in successfully promoting HIV disclosure to partners, HIV testing, diagnosis and treatment referral has accumulated for over three decades. Two early U.S. studies showed that APN was feasible in notifying sex and needle‐sharing partners of people diagnosed with HIV [Indonesia's incarcerated population is the eight largest globally, with more than a quarter million inmates [This research helps to affirm and assist the use of APN in prisons and other criminal justice facilities by implementing and comparing the efficacy of the Impart model of APN that we developed for prison populations versus sole reliance on prison inmates to inform their partners themselves (standard of care). With Impart APN, incarcerated people with HIV voluntarily identify and provide names and contact information for partners in the community with whom they may have shared HIV exposure before incarceration. They then select which of these partners to notify themselves or to have informed anonymously by an Impart two‐person team consisting of a nurse and community healthcare worker. Our study examines the outcome of each form of notification on how many at‐risk partners in the community are notified, their gender and type of risk exposure, and HIV testing outcomes. Its findings respond to the need for research on the effectiveness of APN programmes [