  A Kallen-Lehman approach to 3D Ising model is analyzed numerically both at
low and high temperature. It is shown that, even assuming a minimal duality
breaking, one can fix three parameters of the model to get a very good
agreement with the MonteCarlo results at high temperatures. With the same
parameters the agreement is satisfactory both at low and near critical
temperatures. How to improve the agreement with MonteCarlo results by
introducing a more general duality breaking is shortly discussed.
