This presentation acquaints the audience with the the safety benefits of Aircraft Performance Monitoring.    This presentation will emphasize that unreasonable expectations with respect to aircraft performance have contributed to fatal GA accidents.    The GAJSC also feel that flight data and performance monitoring can help to forecast system/component problems before they reach the point of failure.    Teaching Points:.       Discuss the safety benefits of Flight Data Monitoring (FDM).   Acquaint pilots with the availability of FDM hardware and software.   Encourage pilots to adopt FDM processes.