A master/slave manager has been developped using PVM [7] for parallel synthesis based on SIS. The master process spawns SIS tasks corresponding either to partitioning or synthesis tasks. Partitioning is implemented as a SIS command that interfaces the Metis software. The command splits the network into subnetworks available as data files. Synthesis tasks are spawned with the accurate SIS script on these files. The master/slave paradigm also allows us to mix distributed phases and global optimization on a single processor. The software works on a network of workstations or on a Paragon parallel computer.