In this paper, an interactive tool is proposed for the visualization, editing and manipulation of multiple track sequences. A sequence is associated with an articulated figure and can integrate different motion generators such as walking, inverse kinematics, and key framing within a unified framework. The TRACK system provides a large set of tools for track space manipulations and Cartesian space corrections. This approach allows an incremental refinement design combining information and constraints from both the track space (usually joints) and the Cartesian space. We have dedicated this system to the design and evaluation of human motions for the purpose of animation. For this reason, we also insure the real-time display of the 3D figure motion with a simultaneous scan of the 2D tracks. The interface design and the interaction device integration are realized with the Fifth Dimension Toolkit