Proper analytical procedures presented here allow for rapid simultaneous determination of the diffusion and film-mass-transfer coefficients, the equilibrium gas pressure and solubility, and the effective equilibrium time from a model-assisted analysis of the time-limited experimental data of a gas/liquid system obtained by the method of Isothermal Pressure Decay. Being able to determine all four parameters simultaneously from the same data set, the present data interpretation method provides an additional reduction in the overall effort by a factor of four on top of the reduction in time required for data gathering. The parameter estimation method yields results with high accuracy indicating the validity of the proposed phenomenological model. (C) 2009 Elsevier Ltd. All rights reserved.