Measuring the use of, the need and unmet need for, and the barriers to access assistive technology in the population is important to inform evidence-based policy and programme development, and guide research and innovation for improving access to assistive technology. The Global Report on Assistive Technology published in 2022 presented a comprehensive dataset on population access to assistive technology based on the multi-country rapid Assistive Technology Assessment (rATA) survey. The survey data collection took place between April 2019 and December 2021, in collaboration with governments, research institutes and NGOs. Globally, about 330,000 people were interviewed in 35 countries. The survey questionnaire was translated into 28 different languages and nearly 1,700 individuals were trained locally to conduct the survey. WHO will continue the effort on measuring population access to support its Member States in progressing the World Health Assembly resolution (WHA71.8) on improving access to assistive technology (https://apps.who.int/gb/ebwha/pdf_files/WHA71/A71_R8-en.pdf?ua=1) and report on progress in 2026 and 2030. The objectives of the session are to engage global assistive technology stakeholders to reflect on the methodology, process and outcome of measuring population access in different contexts using rATA, and to set up an action plan for data collection for the WHA Progress Report on improving access to assistive technology in 2026. The session will start with a presentation of the background and overview of population access data collection process and the outcome. Three moderated discussions will proceed to engage participants to address: 1) what improvement is needed to make rATA more effective in measuring population access; 2) what data collection processes would be efficient and sustainable; and 3) how can the global assistive technology sector access and use the data and its findings. The session will end with an outline of engagement with individual experts and organizations. The expected outcome of the session are informed decisions for WHO and partners to develop an action plan and platform for a working group on continued data collection on population access to assistive technology, including a) further development, improvement of the WHO rATA questionnaire; b) improvement on data collection and analysis process for WHA Progress Report; and c) a global platform / forum on sharing of data, knowledge and experience. Following supporting materials are available for the session participants' reference. 1) The WHO rapid Assistive Technology Assessment questionnaire (https://www.who.int/publications/i/item/WHO-MHP-HPS-ATM-2021.1); 2) Protocol for global rATA data collection and analysis as for the Global Report on Assistive Technology (https://www.mdpi.com/1660-4601/18/24/13336); 3) WHO-UNICEF Global Report on Assistive Technology - Section 2: Measuring access to assistive technology (https://www.who.int/publications/i/item/9789240049451); 4) WHO Global Health Observatory – assistive technology data portal (https://www.who.int/data/gho/data/themes/assistivetech). The session is open to all ICCHP-AAATE 2022 conference participants.