Interested in the role of joint committees and commissions for treaty interpretation? See a joint webinar on treaty interpretation organized by the UNCITRAL Secretariat and ISDS Academic Forum here. Conducted on 4 June 2020, a webinar is particularly focused on control by States Parties over the interpretation of their investment treaty in the context of ISDS. My presentation under the title ‘Treaty Parties’ role in treaty interpretation: joint committees and commissions’ is a continuation of the earlier published book chapter in S Gáspár-Szilágyi, D Behn, M Langford (eds), Adjudicating Trade and Investment Disputes Convergence or Divergence? (Cambridge University Press 2020).