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-This paper deals with a new method for eigenvalue region prediction of critical stability modes of power systems based on decision trees. The critical stability modes result from inter-area oscillations in large-scale interconnected power systems. The existing methods for eigenvalue computation are time-consuming and require the entire system model that includes an extensive number of states. However, using decision trees, the oscillatory stability can be predicted based on a few selected inputs. Decision trees are fast, easy to grow and provide high accuracy for eigenvalue region prediction. Special emphasis is hereby focused on the selection process for the decision tree inputs. In this work, a genetic algorithm is implemented to search for the best set of inputs providing the highest performance in stability assessment.