This is an update of the report about an Object Oriented (OO) track reconstruction model, which was presented in the previous AIHENP'99 at Grete, Greece. The OO model for the Kalman filtering method has been designed for high energy physics experiments at high luminosity hadron colliders. The model has been
coded in the C++ programming language and has been successfully implemented into a few different OO computing environments of the CMS and Atlas experiments at the future Large Hadron Collider (LHC) at CERN.
We shall report:
(1) more performance result;
(2) implementing the OO model into the new SW OO framework "Athena" and
the upgrade of the OO model itself.