This paper presents the results of kinetic modeling of high-severity fluidized catalytic cracking process using a simplified methodology of estimating kinetic parameters. A 4-lump model was used to demonstrate the new approach for modeling the kinetics data that was collected using micro-activity test (MAT) method. MAT experiments were done at 550, 600 and 650 degreesC. Kinetic parameters for the 4-lump model and the activation energies are presented. (C) 2003 Published by Elsevier Science Ltd.