DBA Systems, Inc. proposes to fabricate an engineering model of a pc-based video mensuration system for the detailed human factors analysis associated with motor vehicle operation. The baseline for this system will be DBA's off-the-shelf 626 video tracker that tracks video images at real-time rates (60Hz). Enhancements will include the development of real-time fitting and lateral positioning algorithms along with the inclusion of a video tape control interface. The proposed system will be extremely user-friendly in that it uses a standard graphical user interface typical of standard Microsoft Windows 3.x. The video mensuration system will collect data from three points simultaneously on each video field (60 times a second). This collected data will be stored on hard disc for post collection data analysis. The Phase I effort will consist of developing the algorithms, implementing them in an engineering development model of the pc tracker, demonstration of operational concept and validation of the mathematical models.