Billoir Fitter for BaBar

I've been working on a project together with Robert Kutschke on an implementation of a Kalman filter for the CLEOII experiment. A write-up of this work is in progress. Other useful information about the conventions that has been used is in another document by Robert Kutschke. This work has been modified for BaBar.
For the BaBar tracking meeting on November 8 1995 I contributed a short summary of the track fitters interface to the material structures and properties, and the hit information. This note is an overview and does not go into any detailed information.