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In this task, you are given a part of an article. Your task is to generate headline (title) for this text. Preferred headlines are under fifteen words.

As probabilistic systems gain popularity and are coming into wider use, the need for a mechanism that explains the system's findings and recom mendations becomes more critical. The system will also need a mechanism for ordering compet ing explanations. We examine two representa tive approaches to explanation in the literature one due to Gardenfors and one due to Pearl-and show that both suffer from significant problems. We propose an approach to defining a notion of "better explanation" that combines some of the features of both together with more recent work by Pearl and others on causality.
Output:
Defining Explanation in Probabilistic Systems