The third BOOST project (dedicated to boosting access and quality of community-based communicable disease services for PWUD in the EU and neighboring countries) in-person partner meeting took place on May 27th and 28th in Antwerp, Belgium. Twenty-one representatives from BOOST members traveled to Antwerp to discuss the project’s progress and plan its development during the second year since its inception. Dr. Fernandez and Dr. Gogishvili presented the step-by-step adaptation process of the COBATEST data collection tool to meet the needs of Harm Reduction HIV/STI testing centres that took place in the fall of 2023. The adaptation was approved by experts in the fields of Harm Reduction and academia. This work was done in parallel with efforts by the CORE (Community Response to End Inequalities) project which focused more on other key population groups. Both CORE and BOOST projects are co-funded by the European Union. The next steps involved development and implementation of communication strategies to disseminate information about the COBATEST standardized data collection online tool to harm reduction centers offering testing services.