This two-volume handbook offers a comprehensive, coordinated presentation of Superconducting QUantum Interference Devices (SQUIDs), including their fundamentals, design, technology, system issues and applications. The handbook bridges the gap between fundamentals and applications, and will be a valuable textbook reference for graduate students and professionals engaged in SQUID research and engineering as well as for specialists in fields in which SQUIDs are used, including fundamental science, detection of signals from the brain and heart for both clinical and research purposes, non-destructive evaluation of metal structures and semiconductor packaging, detection of nuclear magnetic resonance, and prospecting for oil and minerals.