The Role Models in Elementary Engineering Education has been studying the interactions between elementary students and outreach ambassadors (undergraduate engineering students) in informal outreach setting.  The project used surveys, interviews and classroom video recordings to expand our understandings about how engineering outreach is enacted and how students' perceive that experience.  The findings to date have expanded knowledge about what matters to students and the role they see ambassadors filling.  The project has produced new survey instruments as well as tools that can support training of other outreach organizations.