Implementation of Interactive Motion Representation IMR) within the Data Manager V.ARANOV ***-JAN S.VAN SINT* V.SHOLUKHA**-M.ROOZE*-M.VICECONTI*** * Department of Anatomy, Faculty of Medicine, Universite  Libre de Bruxelles, Belgium ** Department of Applied Mathematics, State Polytechnical University of Saint Petersburg, Russia *** Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna Introduction Standardization of motion representation is a key element for result comparison and data exchange during motion analysis studies. The discrepancies of the results currently found in the literature can be explained by a lack of standards related to at least 3 topics: 1- motion representation; 2- selection of anatomical landmarks ALs); 3- software resources. This literature discrepancy should be greatly reduced if a consensus on the three above points could be reached. Topic 1 is tackled by the International Society of Biomechanics ISB) that published Standards to define body segment orientations and clinically meaningful motionrepresentationWu,1995;Wu,2002;Wu,InPress).EffortsrelatedtoTopic2are currently undergoing to allow strict AL selection necessary to build anatomical reference frames in a repeatable way Van Sint Jan, In Press). Topic 3 is the goal of this paper. The presented research aimed to propose a software interface that would allow a user to: -interactively import motion data; -to register the motion to 3D bone models if necessary); -to select ALs; -and to create motion representation graphs according to standards. Similar commercial tools are available, but they are unfortunately often costly and limited to a few motion representations. Materials and methods TheInteractiveMotionRepresentationIMR)toolsdevelopedduringthisresearch has been implemented within the Data Manager software based on the MAF architecture Multimod Application Frame) Viceconti, 2004; Van Sint Jan, 2005). The aim behind MAF is to develop ``general purpose'' software routines related to operationsneededinMusculoskeletalmodeling:visualizationofmedicalimagingdata,