The Gesture Description Interchange Format (GDIF) is being developed as a tool for streaming and storing data of music-related movements, actions and gestures. Current general purpose formats developed within the motion capture industry and biomechanical community (e.g. C3D) focus mainly on describing low-level motion of body joints. Similarly, music industry formats (e.g. MIDI) are limited to specific hardware and/or playing techniques. GDIF aims at describing gesture qualities, performer-instrument relationships, and movement-sound relationships in a coherent and consistent way. A common format will simplify working with different software, platforms and devices, and allow for sharing data between institutions.