An analysis of magnetic after-effect spectra made by applying the gaussian distribution in ln τ is presented and discussed in details. The procedure described allows to decompose very broad relaxation spectra into several relaxation processes with continuous distributions of relaxation times. This model is applied to the quantitative analysis of isochronal disaccommodation curves obtained for several amorphous and partially crystallized ribbons of Fe 73.5Cu 1Nb 3Si 13.5B 9 (after stress relieving at 673 K for 1 h and annealing at 823 K for 10 s), Fe 87Zr 7B 6 (in the as-quenched state and after annealing at 700 K for 1 h) and Co 66Fe 4Mo 2Si 16B 12 (annealed at 700 K for 30 s) alloys. From this analysis the mean activation enthalpy, pre-exponential factors, intensities and widths of the distributions in ln τ of individual processes are determined.