Abstract: Since the concept of Shared Mental Model was defined, researchers have deemed it an antecedent of team performance. Yet, there remain several issues to be delineated. Shared mental models include various contents that are in various representations, which could be analyzed in terms of heterogeneity/homogeneity and interdependency/independency. Shared Mental Models are hierarchical, including concrete knowledge and abstract categories, as well as attitudes and beliefs directing at them. The only expert-mental model doesn’t exist in logical means. The development and evolution of shared mental models should be of more meanings than approaching to expert-mental models. Finally, “share” is more than an output of team process; it should gain more attention on its role as a team processor

Key words: Shared Mental Model, distribution, accuracy