The power of a graph lies in its ability to convey a variety of complex relationships in a way that is difficult to describe in words, but is easily comprehended from a picture. When designing a graph, consider these points:
- Avoid fussy, excessively complicated graph design;
- Don’t use 3D graphs. They are usually harder to interpret and more cluttered than 2D graphs (see Figure 1);
- Reduce clutter by removing key borders and gridlines (see Figure 1b);
- Avoid bold shading or cross hatching which can cause distracting visual effects (Figure 2);
- Use colour and shading sparingly as it distracts from the message;
- Avoid graph designs that use keys. Where keys are unavoidable, use the simplest key available (Figure 1b);
- When adding text, use plain English, and avoid jargon and repetition. In addition, use the same typeface as the graph (preferably a sans serif font), avoid fancy lettering and fonts, don’t mix upper and lower case lettering, and don’t box the text;
- Where several graphs are used for similar types of information use, where possible, the same scales on the x– and y-axes; and
- Where practicable avoid truncating the axes, unless it will inform rather than mislead the reader (Figure 3).