D1. Diagrams and charts should be used to concisely communicate the relationship between related variables, especially variables that have numeric data presented in tables…
D2. BUT concrete ideas might end up too abstract when presented in graphic form:
D3. Attention should be drawn to captions
D4. The relative importance of elements should be represented by relative sizes in the diagram, thicker lines for stronger relationships, etc.
D5. Graphs depicting more precise amounts should utilize a Cartesian graph (x and y axis)
D6. Graphs depicting comparative amounts where precision is not important may utilize pie charts
D7. Trends should generally be illustrated by line graphs
D8. Comparisons may be illustrated by bar graphs or pie charts