Several examples are shown in which the complementary use of temperature dependent magnetic susceptibility measurements and EPR spectroscopy has provided information which neither technique alone could have given in the study of exchange coupled systems. For instance it is shown how EPR can help in determining the exchange pathways whose existence is observed from magnetic susceptibility measurements and more applications to monitoring weak exchange interactions determining the magnetic dimensionality, disclosing the nature of paramagnetic impurities, looking in detail into the multiplet structure of exchange coupled systems.
