A high level of employee commitment holds particular value for organizations owing to its impact on organizational effectiveness and employee well-being. This Handbook provides an up-to-date review of theory and research pertaining to employee commitment in the workplace, outlining its value for both employers and employees and identifying key factors in its development, maintenance or decline. Including chapters from leading theorists and researchers from around the world, this Handbook presents cumulated and cutting-edge research exploring what commitment is, the different forms it can take, and how it is distinct from related concepts such as employee engagement, work motivation, embeddedness, the psychological contract, and organizational identification.