Sometimes you would face the situation to include an additional topic to your presentation that is not directly linked to the rest of your presentation. In the book Public Speaking Excellence we describe the CORB model to structure the introduction of your presentation. It is important to have a good flow of topics that is easy to follow for your audience. Having to address an unrelated topic will not make this easy. How best to do this?
First see if there is really no link towards the rest of your presentation. It is best to create one storyline in which there is a natural flow of topics that you need to address. If the topic is really not related you should be open to your audience about that to avoid confusion. Tell your audience as part of your introduction (when you follow the CORB model) that you have been requested by person <name> to address one other topic that is clearly unrelated to the rest of your presentation. Tell your audience when you will address this topic. By means of this you create a clear distinction between this topic and the rest of your presentation and you avoid to confuse your audience.
