What you say and how you say it also need to be consistent with the purpose of the presentation. It is likely that you will make two types of presentations:
Informational presentations
Transmit specific knowledge.
Present information directly or through explanation.
Feature statistics or supporting research.
Present ideas in logical sequence.
For example, if asked to provide fire evacuation guidance to the occupants of a residential complex, you would make an informational presentation.
Motivational presentations
Create awareness, change attitudes, or garner support.
Use concrete language to communicate abstract points.
Use vivid and interesting language.
For example, if you are trying to gain community support for a preparedness initiative, you would make a motivational presentation, or one with both informational and motivational elements.