From October 14 to 18, 2019, negotiators will gather in Vienna for the next session of the UNCITRAL Working Group III on ISDS reform, where they will move from considering concerns with the current system to assessing possible solutions. In this ITN Insight, Jane Kelsey discusses various examples of how some countries have tested out alternatives to ISDS, such as state–state arbitration, alternative dispute resolution, domestic legislation and enforcement, and the exhaustion of domestic remedies. For each ISDS alternative, she examines what benefits and challenges arose, and how the lessons learned can help inform the next phase of UNCITRAL deliberations.