The span-of-control definition is the number of reports that are present with the supervisor or manager of the company. This is one of the management techniques and principles that help determine the number of direct reports available to the manager of the organization, and the management process can also be handled effectively. It is also known as the span of management. This is the most important management principle in business management and, most specifically, in human resource management. This concept is mainly concerned with the number of subordinates working in the organization.