Figure 1 Squires guideline for normal working area. Top
view of a woman standing in front of a working surface. When
she sweeps her arms out and sideways with the trunk upright
and the upper arms relaxed, the covered (shaded) area is the
normal working area. The elbows and shoulders are indicated
by black markers. The boundary coordinates of the normal
working area with respect to the intersection point of the
table edge and the midline of the body are calculated as:
X coordinate = k sin /3 - m sin (a) + 112
Y coordinate = k cos /j + m cos (a) - k
where k = abdominal depthn, 1 = bi-acromial shoulder
breadth, m = elbow grip length