A publish-subscribe architecture based blackboard system for selecting and exchanging selected information among a plurality of processing modules using filters for implementing conditions described in a procedural language to reduce the amount of information transmitted between the processing modules. More than one filter may be dynamically installed in a message hub to select and collect the published information to be sent to a certain subscribing module. By using the procedural language to describe the filters, the message hub can more intelligently select the information to be sent to the subscribing module. This reduces the amount of information transmitted via communication channels. Further, the subscribing module may be relieved from the task of filtering the information received from the message hub, allowing the subscribing module to devote more resources to other operations.