How many persons should a supervisor supervise?

The number of personnel that can be directly effectively and efficiently supervised by a supervisor is depending on flatter or more hierarchical organizational structure as well as the capacity of supervisor to supervise the personnel. In the past I have supervised small groups of personnel in my positions from two to five, as well as larger groups reaching up to twenty personnel. I have overseen different projects to make sure that each personnel completed their part and have pushed the personnel to accomplish their set goals and organizational goals. This has lead to acknowledge personnel as “Employee of the Year” in several times during my career and I have been congratulated by the management of my previous company for leading my team to exceeding company goals with customized recent projects directed towards success.