BrainVoyager provides a comprehensive set of tools for EEG and MEG cortical source imaging, which are described in the topics of this chapter. While the documentation in this chapter of the User' s Guide focuses more on the principles and the general application of EEG / MEG cortical source imaging, the EMEG Getting Started Guide (EMEG GSG) will help you to use these tools as quickly and efficiently as possible. You will find the EMEG GSG in the BrainVoyager program folder and are kindly encouraged to read this in combination with this chapter before starting with analyzing your own EEG or MEG data sets. The next section will provide a quick general overview of EEG/MEG Distributed Source Analysis, and all the tools available.