Use consistent symbols. Leave only the essential and functional linework in the graphic to orient the viewer. It is not necessary to frame a graph. If axes are needed on all sides to help the viewer to distinguish the information, all axes must have scales. Avoid special effects if they do not enhance the point to be made.
Special effects can often detract from the intended message.
When designing a table, keep the format clear and simple. Line up decimal places, note units clearly, use a large enough typeface and construct a clean, orderly arrangement of rows and columns. Labels and Lines Be consistent in label size, font, and style. Spell out as many of the labels as possible. Too many obscure abbreviations and mysterious codes will annoy and distract the audience.