The HRI 2015 Workshop "Towards a Framework for Joint Action" is a full-day workshop held in conjunction with the 10th ACM/IEEE International Conference on Human-Robot Interaction, in Portland (USA) on March 2nd 2015. The first edition of the workshop took place at RO-MAN 2014. This workshop aims at bringing together researchers from several disciplines to discuss the development of frameworks for analyzing and designing human-robot joint action. It is meant to provide the opportunity to researchers interested in joint action, roboticists but also philosophers and psychologists, to discuss in depth the topic and to contribute to the elaboration of a framework for human-robot joint action. To achieve this goal, we propose to the community to tackle a COMMON EXAMPLE (as it is sometimes done in robotics planning competition) with the goal to identify the capacities and skills needed for the successful performance of the joint action. This should enable us to build upon each other's experience to further develop ongoing work. The proposed example is described on the workshop website: fja.sciencesconf.org