A project-schedule diagramming application enables generation of a diagram of a project schedule including a plurality of tasks. A data set defining each task is received from a user. The data set includes a start time and finish time for each task, an indication of at least one functional relationship between one or more tasks, and a type of each task. A user interface including an illustrated timeline is displayed, as well as a plurality of graphical elements respectively representing the plurality of tasks. Each graphical element illustrates the task start and finish times with reference to the timeline. The size of each graphical element is proportional to a duration of the represented task. Each graphical element is displayed in a format corresponding to the respective type of task represented by the graphical element. Connective elements between the graphical elements illustrating the functional relationships are displayed.
