In today's world, clean and robust energy sources are being sought to provide power to residences, commercial operations, and manufacturing enterprises. Among the most appealing energy sources is wind power-- with its high reliability and low environmental impact. Wind power's rapid penetration into markets throughout the world has taken many forms. In some cases, wind power is produced in large industrial wind farms by large horizontal-axis wind turbines (HAWTs) that supply power directly to the grid. In other cases, wind power is produced more locally, at or near the site of power usage. In these cases, the wind is typically generated by smaller wind turbines that are in single-unit installations or in clusters of units. Regardless of the manifestation of the wind turbine systems, much thought must be given to the selection of the turbine, the economic viability of the installation, and the integration of the system to the connecting grid. It is the intention of this text to discuss these issues in detail so that appropriate decisions can be made with respect to wind power design, testing, installation, and analysis. The specific focus is on small-scale wind systems. While there is no universal definition of small-scale wind power, it generally refers to systems that produce only a few kilowatts, can be installed in constrained spaces, and have a small footprint.