The book "Design of Energy-Efficient Application-Specific Instruction Set Processors" offers a comprehensive introduction to the design of energy-efficient application-specific instruction set processors (ASIPs). It covers the fundamentals of low-power VLSI design and introduces the design spaces of ASIP instruction set architectures (ISAs), focusing on the essential features for digital signal processing. The author proposes a consistent ASIP design flow that starts with a given application and pursues an incremental optimization of the ASIP hardware, ASIP coprocessors, and ASIP software. A practical approach to ASIP design is enabled through a top-down methodology and application-specific modifications at all levels of the design hierarchy. Design decisions are illustrated using a variety of real-world signal processing applications, and two complete case studies demonstrate the feasibility and efficiency of the proposed methodology.