Presentation professor Andrew Abela suggests if you have a board room presentation with comparison data which changes over time for many periods you use one of two types of charts:
Non-cyclical data - Line chart
Cyclical data - Circular Area chart
Non-cyclical data - Line chart
Cyclical data - Circular Area chart
Comparing,
Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com
