Since 2016 the World Health Organization (WHO) has recommended differentiated service delivery (DSD) (1),  defined as “a client-centred approach that simplifies and adapts HIV services across the cascade, in ways that  both serve the needs of people living with HIV better and reduce unnecessary burdens on the health system”  (2). These recommendations include approaches for DSD of antiretroviral therapy (ART) that are less intensive  and provide person-centred services to improve both quality and retention in care. As a result many countries  have introduced or are scaling up DSD ART models. Currently, countries and partners are seeking to strengthen  monitoring of differentiated ART service delivery to address implementation gaps and crucially improve  patient outcomes. Recognizing the need for guidance on monitoring DSD of HIV treatment, WHO published the 2022  Consolidated guidelines on person-centred HIV strategic information, which included for the first time guidance  and recommendations for the collection, reporting and use of data on DSD for ART (Box 1) (3). This policy brief  summarizes this guidance along with progress in country implementation and innovations from key countries.