The Lead Implementing Body for the Master Plan on ASEAN Connectivity (MPAC) 2025 Strategic Area of Sustainable Infrastructure (LIB-SI) held the ASUS Socialisation Forum for Cities in Jakarta on 20-21 February 2020. The Forum was part of the ongoing efforts to socialise and implement ASUS, and as a follow-up to the interest expressed by cities across ASEAN to cooperate under the ASUS framework. The Forum served as a platform to enhance understanding and knowledge on designing, planning, and managing sustainable urbanisation of cities. It also provided hands-on exercise to develop high quality project concepts with the ASUS toolkits to engage external partners for support. The two-day forum was organised with the assistance of the ASEAN Secretariat and the Deutsche Gesellschaft fr Internationale Zusammenarbeit (GIZ).