Introduction. The Bereitschaftspotential: What does it measure and where does it come from? M. Jahanshahi, M. Hallett. From Surface to Depth Electrodes. Surface recordings of the Bereitschaftspotential in normals; W. Lang. The Bereitschaftspotential and the conscious will/intention to act; B. Libet. Generator mechanisms of the Bereitschaftspotentials as studied by epicortical recording in patients with intractable partial epilepsy; A. Ikeda, H. Shibasaki. Intracerebral recordings of the Bereitschaftspotential and related potentials in cortical and subcortical structures in human subjects; I. Rektor. Dipole Source Modeling and the Generators of the Bereitschaftspotential. Distributed source modeling in the analysis of movement-related activity; R. Kristeva-Feige. Recordings of the movement-related potentials combined with PET, fMRI or MEG; C.D. MacKinnon. Generators of the movement-related cortical potentials and dipole source analysis; K. Toma, M. Hallett. The Bereitschaftspotential in Patient Groups. Surface recordings in patients with movement disorders and the impact of subcortical surgery; P. Praamstra, M. Jahanshahi, J.C. Rothwell. The Bereitschaftspotential in schizophrenia and depression; K.P. Westphal. Movement-related cortical potentials in patients with focal brain lesions; C. Gerloff. Other Related EEG Measures. Movement and ERD/ERS; G. Pfurtscheller, C. Neuper. CNV and SPN: Indices of anticipatory behavior; C.H.M. Brunia. The lateralized readiness potential; M. Eimer, M.G.H. Coles. Other Approaches to Measuring Motor Preparation. Movement selection, preparation, and the decision to act: neurophysiological studies in nonhuman primates; S. Wise. Movement preparation: neuroimaging studies; I. Toni, R. Passingham. Finale. Human freedom, reasoned will, and the brain: the Bereitschaftspotential story; L. Deecke, H.H. Kornhuber. Index.