No 1005 (00540) Family name : Jegerlehner Given name : Fred Affiliation : DESY Abbreviation : E-mail address : fred.jegerlehner@desy.de Title : Steps towards full two-loop calculations for 2 fermion to 2 fermion processes Authors : Fred Jegerlehner Abstract : We are in progress of developing a package for full two-loop SM calculations of 2 --> 2 fermion processes, with emphasis on the analytical approach where feasible. The complete two-loop on-shell renormalization is implemented. Substantial progress has been made in calculating master integrals. We are able to compute in an efficient and stable manner up to a few thousands of diagrams of very complex mass structure.