In this paper, we present a research oriented open challenge focusing on multimodal gesture spotting and recognition from continuous sequences in the context of close human-computer interaction. We contextually outline the added value of the proposed challenge by presenting most recent and popular challenges and corpora available in the field. Then we present the procedures for data collection, corpus creation and the tools that have been developed for participants. Finally we introduce a novel single performance metric that has been developed to quantitatively evaluate the spotting and recognition task with multiple sensors.