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The increasing complexity in structures and operations of the Greek Public Administration Reform (G.P.A.R). system with "deterministic '" and stochastic characteristics demands the application of model that would portray the dynamic elements and interpretive relationships of this system. In this article, we introduce a new approach to the description, analysis and synthesis of a public administration reform system. Through consensus models of decision making we try to develop methods for idea generation and classification in order to eliminate barriers that could impede the system success in relation to his vision, mission and objectives. Given, the increasing complexity in the system structure and functions the consensus methodology that we develop in the article constitutes an essential problem solving approach as far as design, control, co-ordination and reengineering concern. As systems become increasingly complex, the need for such techniques of analysis becomes more intense. In response to this need, system thinking theory through consensus models has developed to incorporate both the deterministic and probabilistic characteristics of a social organization