Your goal in all presentations should be to educate and inform your audience. You won't satisfy this goal if you sidetrack or confuse the audience. Make sure the stages of your presentation, and the visual aids you use, follow a logical sequence. Use transitions to help the audience understand how successive stages are related to each other, and to the big picture.
One effective strategy is to begin and end the presentation with an identical pair of visuals, which summarize the main points you hope to convey to the audience.
Another aspect of consistency in a presentation relates to the Format you've chosen.
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