To pitch a presentation correctly, you must consider the audience in terms of their level of knowledge, the degree of formality and the type of language used. Here are a few things it is helpful to find out:

• What do members of the audience do? (Are they students, lecturers, or others?)
• Who do they work for? (if appropriate)
• What do they already know about the subject that you are going to talk to them about?
• What will be new to them?
• What is the history of the relationship between yourself and the people in the audience. Do they trust you? Will they believe you? What do they know about you?
• What interests your audience - do they have any subjects that they care passionately about?
• Will anything that you are going to say alarm them?
• What is the benefit to the audience of listening to your presentation?

Once you've considered these points you can now begin to choose what you will say and show in your presentation, knowing that it will be of interest or benefit to most of your audience.