1. A task management system connected to a communication network with one or more users operating respective computing devices, the system comprising: one or more task management computers executing an application, with which said users interact via respective computing devices, the task management system being configured to enable one or more first users to generate a designation of one or more second users to a task-list or a task, the task being a member of one or more task-lists, said task-list and task having associated permissions, the task management computer changing automatically said permissions of said task-list and said task with respect to said second users based on said first-user designation.