The IWG on Prioritization was established under WP.29 Vice-Chair leadership with participation of GR Chairs. A preliminary session held 2 June 2026 reviewed a UK document listing priority workstreams and discussed prioritization and efficiency as separate considerations. The IWG agreed on the need for flexibility and discussed digitalization of WP.29 report activity. Future sessions will address common understanding of prioritization, review of current GR activities, possible approaches to define prioritization, and enhancement of efficiency, with participation expanded to include CPs and NGOs.