This session will cover practical aspects of seismic tomography applied on different scales (from first km to the global scale) for different observation systems such as: local earthquake, teleseismic, regional and global body and surface wave tomography schemes. Contributions that address problems of attenuation, anisotropy, and waveform inversion are welcomed. Special attention shall be given to the problems of data quality assessment, verification of tomographic results, and benchmarking existing algorithms.