This study explores the possibility of adding Knowledge Based Cognitive Psychology assessment within the Group Decision Making and outlines some of the necessary guidance for designing a Knowledge Based Group Decision Support System (KBGDSS). This framework is using intelligent agent communication and graphical user interface. This prototype, which consists of a data base, knowledge base, model base and agent communication language along with the graphical user interface, will help the group of decision makers to select and solve the problem. The end result is a system that will dynamically adapt to the person using it. The system will be able to identify the nature of the decision-maker currently involved in the process and provide him/her with solutions specifically tailored to that personís unique mental composition.