Abstract: In a production system in which a plurality of production rules are partitioned into a plurality of clusters for processing to effect cluster control, control expression elements, each describing an instruction for specifying a cluster to be invoked next for execution or an instruction for other flow control, are arranged in the order of execution to provide a control expression part separate from the clusters for processing. An instruction for a return to the control expression part is described in an action part of an appropriate production rule in a cluster, in place of the cluster specifying instruction, so that sequential invocation of clusters can be performed following the instructions described in the control expression part, thereby making it unnecessary to give a description for specifying the name of a cluster to be invoked next for execution in the action part of each production rule.

Abstract: In a production system in which a plurality of production rules are partitioned into a plurality of clusters for processing to effect cluster control, control expression elements, each describing an instruction for specifying a cluster to be invoked next for execution or an instruction for other flow control, are arranged in the order of execution to provide a control expression part separate from the clusters for processing. An instruction for a return to the control expression part is described in an action part of an appropriate production rule in a cluster, in place of the cluster specifying instruction, so that sequential invocation of clusters can be performed following the instructions described in the control expression part, thereby making it unnecessary to give a description for specifying the name of a cluster to be invoked next for execution in the action part of each production rule.

Abstract: In this computer system, a plurality of processing elements (PE), each having at least two channel processors which manage corresponding communication channels separately, are connected in a ring via the channel processors to form a processing element loop (10). Some of the processing elements are designated as process managers (SM.sub.1 -SM.sub.n) which manage the corresponding process frame groups (20) comprising a predetermined number of process frames. At least one other element is designated as a master manager (MM) which manages those process managers. The respective process managers (SM.sub.1 -SM.sub.n) each allocate a predetermined process to any one process frame of the process frame group (20) which that process manager manages in accordance with each requirement from the master manager (MM) to cause that process frame to execute the predetermined process.