A parallel extension of Sather for a clustered shared memorY model. It features threads sYnchronised bYmonitor objects ("gates") localitYassertions and placement operators. There is an implementation for the CM-5. ["pSather Monitors: Design, Tutorial, Rationale and Implementation", J.A. Feldman et al, TR-91-031 and TR-93-028, ICSI, BerkeleY, CA]. (1995-03-13)