Which of the following is a weakness of bar chart?  

Concept:

• A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent.
• In order to show the bar chart for activities the length of the bar represent the time required for completion of that activity.

The main advantages of bar charts are

• Bar charts are easy to read and understand
• The clear relationship between size and value allows easy comparison.

The main disadvantages of bar charts are:

• It cannot show sufficient detail to enable the timely detection of schedule slippages.
• The spare time for the activities cannot be determined.
• The bar chart does not show the dependency relationships among activities
• It is essentially a manual graphical presentation.
• The schedule can not be updated.
• Progress of the project can not be determined by bar chart
• Bar graphs tend to be locked into a particular data set, making it hard to show multiple values or changes over time unless the chart is modified.