In January 2019 we were invited to lead our workshop on the behavioral science of relationship-building, How to be Helpful: Building Relationships for Social Impact, as part of the GI-ACE Inception Workshop in London. GI-ACE is the Global Integrity Anti-Corruption Evidence Research Programme, which supports world-class research on how to build more effective policies and interventions that will reduce corruption in developing countries. Over 25 members of the 14 multi-disciplinary teams took part.