Dialog Semiconductor's Carsten Wegener, listed with PMIC Analog in Germering, presents a model-validation process for analog behavioral models used in event-driven chip-level mixed-signal verification. The paper argues that modeling requires an associated validation process and demonstrates the approach on a mixed-signal digital I/O buffer treated as a 1-bit DAC and ADC, using post-handoff model bugs and issues as one measure of model quality.