All the figures are done using excel.
##Rule of Thumb
No unjustified 3D: Occlusion hides information : Some of the objects cannot be seen becomes of other objects. The height or are of one attribute covers other attribute.
###Bad Design
To show a bad design I used 3D column plots. Here the count of all the categories of students in an institution is taken in different years. Each category of students is represented by differenct colored blocks and year on x-axis and count on y-axis.Z-axis has grad,undergrad, Phd,High School and Secondary school. Some of the blocks cannot be seen like the blocks in the year 1994 are not seen because of occlusion. This problem can be refined by using a 2D Column graph.
###Good Design
To show a good design I used 2D column chart.As in the 3D chart here,different categories of students are given different colors and they are grouped by year on x-axis and count on the y-axis. Here there no occlusion and all the data can be seen clearly.
