In general, the relations between activities are usually in series or parallel. The relation depends on the nature of the activities, and this should be considered in preparing the time schedule.
The Gantt chart is the oldest and most traditional method used to present project schedules to this day. But the relations between all the activities are not presented well by this method, and you cannot go through the detailed activity as accurately. Therefore, it would only be useful in presentations for high-level management, as it presents enough information for level one of the schedule, but for more detail another method is needed.