Abstract: The invention is related to a method for the selection of an insole and/or of a shoe that adjusts the posture of the foot and for determination of the biomechanical mode of operation of the foot. In the method, the determination of the mode of operation of the foot is carried out by placing the foot on a symmetry axis of a measurement base, and the load thus applied by the measurement base to a rigid support base in relation to the symmetry axis of the measurement base is measured. For the measurement, the supposed symmetry axis of the foot to be measured is aligned with the symmetry axis of the measurement base by guiding the position of the foot onto said symmetry axis by the heel and by the toes. The measurement of the load is carried out preferably in two stages so that first the load is measured when the person stands on the measurement bases with straight legs, and thereafter the load is measured when the knees have been bent substantially 45.degree. from the straight posture.