Task hierarchy in an event-driven communication system

A hierarchy of project and personal tasks is maintained for users associated with multiple projects. The hierarchy is maintained using a computer server machine having a processor and network connection to a client machine having a computer display. A user-task list is obtained. The user-task list includes a first-project task having an initial first-project task score, wherein the first-project task is associated with a first-project, the first-project having a first-project task list including the first-project task The user-task list also includes a second-project task having an second-project task score, wherein the second-project task is associated with a second-project, the second-project having a second-project task list including the second-project task. The user-task list also includes an initial user-task hierarchy ranking the first-project task and second-project task based on the initial first-project task score and the second-project task score.