The SBI model is a simple framework for giving feedback that focuses on the situation, the behavior, and the impact. The situation describes when and where the presentation took place, the behavior describes what the speaker did or said, and the impact describes how the behavior affected the audience, the message, or the outcome. The SBI model helps you give feedback that is factual, objective, and clear, and avoids generalizations, assumptions, or judgments. For example, you could say "in your presentation yesterday, you used a lot of technical terms that the audience did not understand, and this made them lose interest and miss your main points".
Giving feedback in public speaking can be challenging, but also rewarding. By following these tips, you can give feedback that is specific, constructive, timely, relevant, respectful, and reciprocal, and that uses the sandwich method and the SBI model. By doing so, you can help the speaker improve their skills, confidence, and performance, and also learn from them and improve your own skills as a feedback giver and a public speaker.