MITRE-Bedford ALEMBIC: MUC-4 test results and analysis

This note embodies our analyses of the performance of the ALEMBIC system in the MUC-4 evaluation task. These analyses have provided us with a reasonably good understanding of the principal factors contributing to the system's correct responses and to its errors. This understanding is based in part on interpretations of the performance measures provided by the MUC-4 scoring software; in addition, we performed a number of qualitative and quantitative investigations into linguistic aspects of the messages that underly the system's performance.