Dynamically Imroving Explanations: A Revision-Based Approach to Explanation Generation

2. A b s t r a c t D iscou rse R e v i s i o n : I t iteratively applies revision operators to the abstract discourse plan to create a draft tree, where each node is a draft that was derived from its parent by applying a revision operator. Figure 4: Example sentential specification 3. D iscourse P l a n G r o u n d i n g : I t reconstitutes abstract discourse plans as ground level discourse plans by first locating the syntactic and semantic information that was stored away during the abstraction phase and then integrating it into the structures specified by the abstract discourse plan. The revised ground level discourse plan is then passed to a surface generator, which produces the final expla-