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Due to growing number of embedded electronics, estimating failure related to system-level electrostatic discharge (ESD) consideration has become a major concern. In this paper, a behavioral modeling methodology to predict ESD failures at system level is proposed and validated. The proposed models enable time-domain simulation to determine the voltage and current waveforms inside and outside an integrated circuit during ESD events and then to predict the susceptibility of an electronic system to ESD. The purpose of this methodology is based on the improvement of Input/output Buffer Information Specification files widely used in signal integrity simulation. A simple case study is proposed to investigate the susceptibility of latch devices to transient stresses. Simulations and measurements are compared. Analytical formulations to determine the probability of susceptibility failure are proposed and compared with measurements.