What distinguishes the ZU method from other interpretations of Foot Reflexology is the indepth, analytical study of the identification of reflex points on the foot, otherwise known as I.S.R.A., or Identification of Sensitive Reflex Areas. All the points described have been localized in relation to the bones and by aiming at the epicentre of the pain in each sensitive area. A foot can be long, wide, short, large or thin; pathologically, it can be flat, hollow, equine, varus, valgus or twisted. This type of reading objectifies the reflex points.