Abstract: By analyzing the nondeterminary of the infomation in situation assessment and the insufficiency of plan recognition, a technictue for multiple attribute plan recognition based on intuitionistic fuzzy theory was proposed through the combination of intuitionistic fuzzy theory and plan recognition. Therefore, multiple attribute plan recognition models based on Intuitionistic fuzzy sets were built up and calculating methods were given. Concrete examples demonstrated the validity and correctness of the models. The results of the experiment show that the models can promote the efficiency and reliability of thread assessment and give vivid description of trend anticipation.

Key words: Thread assessment,Intuitionistic fuzzy sets,Plan recognition,Multiple attribute decision making