Quantities and relationships must be visually compared. By adding illustrations to your spoken words, you add understanding to what you are saying and enliven interest in your presentation. An outline of your major topics should be your second slide, just after the title. Trends - Line graphs show trends or correlations effectively. Comparisons and Proportions - Bar graphs are best for comparing magnitudes.
Pie charts are good for showing relative parts of the whole.
Symbols - Symbolic diagrams and flow charts are useful if not too detailed. Use standard symbols if possible. Structure and Relationship - Simple schematic diagrams effectifely convey the structure of systems or relationships of objects. Show only what is necesssary to explain how a thing works. Tables - Don't use detailed tables.