A theory of three-way decisions is formulated based on the notions of three regions and associated actions for processing the three regions. Three-way decisions play a key role in everyday decision-making and have been widely used in many fields and disciplines. A group of Chinese researchers further investigated the theory of three-way decision and applied it in different domains. Their research results are highlighted in an edited Chinese book entitled "Three-way Decisions: Methods and Practices for Complex Problem Solving." Based on the contributed chapters of the edited book, this paper introduces and reviews most recent studies on three-way decisions.
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