The document outlines a workshop on data reuse held on December 16-17, 2014 in Barcelona. The workshop consisted of presentations on projects involving data collection and reuse, including DRIVE C2X and EUDAT. Participants performed hands-on exercises to examine vehicle data from the US and Europe, identify errors, and discuss best practices for labeling and sharing data between projects to facilitate reuse. The goal was to provide guidance to the field test community on data sharing and reuse methods to enhance the FOT methodology handbook.