Examines »program adjustment», a formal and practical approach to developing correct concurrent programs, by automatically adjusting an imperfect program to satisfy given constraints. A concurrent program is modeled by a finite-state process, and program adjustment to satisfy temporal logic constraints is formalized as the synthesis of an arbiter process which partially serializes target (i.e. imperfect) processes to remove harmful nondeterministic behaviors. Compositional adjustment is also proposed for large-scale compound target processes, using process equivalence theory. We have developed a programming environment on the parallel computer Multi-PSI, called MENDELS ZONE, that adopts this compositional adjustment. The target concurrent programming language, MENDEL, is based on a high-level Petri net. Adjusted programs can be compiled into the kernel language KL1 and executed on Multi-PSI.