Use of Co-operative Principle and Politeness Principle in CommunicativeActivities from the Perspective of Grey System Theory

Co-operative Principle guarantees the efficiency and validity of communicative activities, while Politeness Principle makes sure that these activities are carried out under a friendly and harmonious atmosphere so as to increase the success rate of the communicative activities. Striking a balance between these two principles to achieve successful communicative activities is a vital pragmatic strategy. This paper aims at finding out the rules guiding the use of these two principles from the perspective of Grey System Theory, which are supposed to be helpful to our communicative activities.