The Gantt graph or series is used to represent the progress of a set of activities as
horizontal bars. It has three
mandatory series components, Start, End, and Value. The
data in the first two
components specify the start and end times of the activities while the data in
the last component specify the vertical positions of the horizontal bars that represent the
activities. It also has an optional component called LabelMember whose
data may be used as the mark labels for the bars.