Person managed (or managed resource) is a person who can be assigned to work on projects in Runn.
Users are people who require access to Runn, but are not necessarily involved in project-related assignments, such as those in HR, Accounting, or the CEO. Users are not assigned to projects nor can they be allocated assignments. Users are free and unlimited so you can add as many as required.
Please note: an individual also has the ability to function as both a managed resource and user simultaneously.