ANSI/ESDA/JEDEC JS-001 is the joint standard of the ESD Association and the semiconductor engineering council that replaced the two separate human body model documents previously maintained by each body, and it is the reference against which an integrated circuit is classified for electrostatic discharge sensitivity today. The standard defines the equivalent circuit of the human body, expressed as a capacitance and a series resistance, and the discharge current waveform that circuit produces, including the rise time, the peak current and the decay and the tolerances within which the test equipment must reproduce them. It specifies how the device is powered, how many discharges are applied to each pin combination and in which polarity, and what constitutes a failure, covering both catastrophic damage and the parametric shifts that must be reported even when the device still functions. Alignment of the measured waveform between different test systems is a central concern, since a classification is only meaningful if it can be reproduced elsewhere.