The magnetostrictivity (d) and magnetostriction ( lambda ) of high coupling magnetomechanical amorphous ribbons and wires are determined without the use of a direct magnetomechanical measurement. The method relies on an easily measured magnetic property (permeability) of the magnetostrictive material obtained under the conditions of constant stress and constant strain ( mu /sup c/). The magnetomechanical nature of the measurement enters through mu /sup c/. Experimental results are compared to predictions made on the basis of the single-vector magnetization rotation model. The effect of demagnetization on the magnetostrictivity and coupling factor is also calculated for long thin ribbons and wires. >