Answer to Question 1
Bar charts are an ideal way to communicate with a universal audience. Bar
charts are clear representations of when activities are to Occur. If projects were built
as they were originally scheduled, there would be little need to use any other
scheduling tools. Unfortunately, schedules are rarely exact portrayals of how projects
are actually completed. Updating is almost always a scheduling requirement as some
activities are delayed and others run ahead of schedule. Changes are also commonly
made to projects and these must also be reflected in the schedule. Precedence
diagrams are a convenient way of incorporating changes in the schedule and they are
also a convenient way of updating the schedule.
Also, since most scheduling software easily toggles between precedence diagrams
and bar charts, it is very convenient to use the format of the schedule that is most
applicable at the time. As a result, it is easy to use bar charts for one purpose and
quickly convert the schedule to a precedence diagram for another purpose.
Answer to Question 2
D