Not your performance, their performance. The audience must go out and apply the information you have given or they wasted their time. Even worse, YOU wasted their time. As speakers it’s our obligation to supply practical methods for the crowd to make our words and ideas reality in their lives.
Buying your LCD projector in isolation from the screen without considering how they work together is likely to cost you more and give you less than perfect results.
Alistair clearly knew his subject – but what was frightening him was the thought of the major presentation that he was going to be making in a month’s time.