This technique was developed by Donald Harrison, PhD, DC, MSE in 1980. The basic philosophy and goals are to restore the body and spine to their optimum alignment; to resist gravity and distribute load properly to body parts; and to restore the lateral spinal curves to their optimum normal curves for optimum motion. Chiropractic Biophysics works to change abnormal postures to normal. Abnormal postures are set up in MIRROR-IMAGE* postures, and full spine adjustments are performed either on Drop Tables or with hand-held instruments. Due to the nature of the technique, the adjustment can be performed using a 'sliding scale' from extremely low to maximum force depending on the individual postural correction responses and the patient's tolerance and preference. Adjustments are performed to place body parts in their optimum positions to resist gravity, decrease abnormal loads, increase ranges of motion and to prevent further degeneration. This is done by correcting the spine to normal and by correcting various abnormal postures and abnormal cervical, thoracic, and lumbar lateral curves. X-rays are generally used with this technique for pathology, biomechanical analysis of spinal misalignment, and for spinal curves. They are also used to monitor spinal changes to normal alignment.