In-beam spectroscopy of exotic nuclei with OSIRIS and beyond

The experimental techniques and recent results of nuclear structure studies in-beam close to 100Sn are reviewed. The structure of the nuclides 97Ag, Cd-100 and 104Sn, so far the nuclei of closest approach to 100Sn with known excited states, is discussed within the spherical shell model. The basic shell model parameters of 100Sn, single particle binding energies and two-body matrix elements, as deduced from the shell model analysis, are summarized. From the available structure information conclusions are drawn for the design and expected phenomena of future experiments towards the far-from-stability doubly magic 100Sn.