Following the long-standing tradition of the Seeheim-Workshops on Mössbauer Spectroscopy, 1978, 1983, 1988, 1994 always held in the same traditional place of the Lufthansa Training Center in Seeheim/Germany, the 5th workshop took place in 2002. The main topics covered are: -new technical developments such as the techniques of Nuclear Inelastic Scattering (NIS) and Nuclear Forward Scattering (NFS) of Synchrotron Radiation and their applications in studying lattice dynamics, magnetism and surface phenomena; -investigations of molecular structural and bonding properties in biomolecules and coordination compounds; -problems related to geochemistry and earth sciences; -applications of Mössbauer spectroscopy in molecular magnetism and photomagnetism. The book will serve as a source of great actuality to physicists, chemists and geoscientists employing the Mössbauer effect and other hyperfine interaction techniques to explore solid state properties of bulk materials as well as surface phenomena.