This report summarizes the presentations and discussions on the research activities presented at XP 2014, the 15th International Conference on Agile Processes in Software Engineering and Extreme Programming, which was held May 26-30, 2014 in Rome, Italy. XP conferences are major supporters of the agile vision of software developers, the related multidisciplinary research, and bridging industrial practitioners with academia. XP 2014 continued this trend, hosting research papers divided in the topics of agile development, agile challenges and contracting, lessons learned and agile maturity, how to evolve software engineering teaching, methods and metrics, testing and beyond, and lean development.