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The focus of this volume is on postsilicon adaption to overcome process and environmental variations, to ensure that a design operates to specifications even in the presence of process and environmental variations. Some of the topics covered include: an introduction, discussing sources of variation and the notion of a control system with a feedback loop to adaptively compensate for variations; adaptively changing body biases, processor frequencies, and supply voltages to react to variations; an Intel view, demonstrated on the design of a TCP/IP processor with dynamic and adaptive supply voltage, body bias, and frequency optimization, including measurement results; building ultradynamic-voltage-scaled (UDVS) systems; the design of the XScale embedded processor; the design of sensors for monitoring critical-path delays under variations, including control and calibration mechanisms; architectural methods for adaptive computing; asynchronous systems and adaptation; and SRAM design and optimization and testing techniques specific to adaptive systems, as demonstrated on the Intel Montecito processor. The book brings together a variety of voices, explaining various views regarding on-chip adaptation. The overall story comes across extraordinarily well and lucidly.