All of the tasks listed on the project plan need to be assigned to an individual or team. The person or persons responsible for a task will need to know in detail what the task involves and also the dependencies and timescales, which can be clearly communicated to them using the Gantt Chart.
The tasks need to be scheduled in the correct order and dependencies between tasks factored in. In complex projects several tasks will be performed in parallel to maximise the total project time. The plan will also take account of the project budget.