Emphasizing preparing for a range of different audiences, Chapter 17 opens by asking readers to think about who might respond particularly well to the demonstrations that they are developing. The chapter contrasts audiences in informal learning settings and elsewhere. For the former, it’s important to have a pitch that is friendly and enthusiastic, and to be clear that your activities are free for everyone. Strategies for increased inclusivity are suggested. Summarizing some guiding principles, the chapter returns to the strands of science learning in the context of knowing your goals; considering how given and new vary across people, and planning ahead are also emphasized. Concerning applied audiences such as teachers or lawyers or policy makers and academic audiences, the principle that incomplete is not incorrect is again stressed. With all kinds of audiences, practice is paramount. The Worked Example uses a demonstration with George Bernard Shaw’s "ghoti" spelling, adjusting the spin for several different audiences.