================================================================================ P9304 S.F.M. van Vlijmen & A. van Waveren "On generating synchronous interworkings from PSF process traces" Synchronous interworkings are a specification formalism on their own right, but might also be of help when analysing processes and process traces. In this paper the processes are specified in PSF and traces are PSF process traces. The main part of this paper is concerned with the definition of the notions needed to perform the generation of interworkings from traces and the conditions under which the generation is feasible. Furthermore we give a pseudo-code algorithm for the interworking generating function, give examples based on a trace of the Alternating Bit Protocol and discuss informally the role synchronous interworkings could have in the specification process.