ERL, LLC recognized that the automotive industry creates seat designs
for supporting "slumped" postures.   To rectify this design problem for comfort,
ERL, LLC created nine human body models (shown below) that represent the range of
body sizes from small female to large male sitting in three different back postures:
erect, neutral, and slumped.   The resulting population contains ten occupants that
the ERL software designs the seat to accommodate for both comfort and ergonomics,
and SgRP compliance.   ERL has used this population mix to design and evaluate seat
designs in over 60 vehicle programs for a global OEM.
The automotive industry developed a human body model that was adopted by SAE in the
1960s to serve as a standard representative of the automotive adult occupant in
reporting the dimensions of the interior and seat.
Over the years, this human body
model (i.e. Oscar) became a design standard because of its association with the
Seating Reference Point (SgRP).   This point became the standard for all seats, in
the form of an H-point test.   Consequently, the H-point machine became the design
standard used by seat suppliers, and iterative rides with drivers and passengers
sitting in the seat were used to evaluate the seat for comfort.