Star plots

http://en.wikipedia.org/wiki/Radar_chart

In a star plot there can be multiple variables being compared. A star is formed when the lines from the variables connect creating a star shape. The above is an example of a star plot used by NASA to compare different design results. They are testing each design for accuracy, collision, time, mass, link defection, trajectory completion, and actuator saturation. The center of the star plot represents the most desired results, which in this case is the MER IDD and is represented by the red line.