This SAE Recommended Practice describes head position contours and procedures for locating the contours in a vehicle. Head position contours are useful in establihing accommodation requirements for head space and are required for several messaures defined in SAE J 1100. Separate contours are defined depending on occupant seat location and the desired percentage (95 and 99) of occupant accommodation. This document is primarily focused on application to Class A vehicles (see SAE J 1100), which include most personal-use vehicles (passenger cars, sport utility vehicles, pick-up trucks). A procedure for use in Class B vehicles can be found in Appendix B.