A quiz can help to clarify the main points of a presentation. By showing users the correct answer after they’ve submitted their choice, or by allowing users to keep submitting answers until they’ve gotten it right, trainers can reinforce the most important pieces of information. Furthermore, quizzes can help you identify and track which trainees understand your material. Sometimes new learners’ training occurs during periods in which your hire is on probationary status. If weeding out the slower learners is a goal, consider withholding the correct answers from the trainee, while results are still reported in full detail to the trainer. 

And finally, quizzes can help measure users’ learning. Consider opening your presentation with a quiz that users will find challenging — and then finish the presentation with the same quiz. That first test can help tip users for information to watch for throughout the rest of the lesson.