The concept of generalized admittance circles(GAC)is presented based onthe analysis of the cole-cole plot
admittance circles of piezoelectric vibrator andcomplex impedance of granular boundary ceramics.It is shown that GAC is a veryuseful concept for the measurement of dielectric materials.Debye relaxation is found todepend not only on the micro-mechanism of the matter
but also on the method ofmeasurement.The effect of inductance is observed in the electronic ceramics.