Choosing the most effective communication method is important, but what is more important is that the message is UNDERSTOOD and COMPREHENDED. One of the most effective ways to do this is to assess the understanding of the group following the presentation--the best way to do this is to tell the group that there will be an assessment at the end of the presentation which will have some sort of incentive attached to it. You can use a short quiz, or an oral Q&A, or both..if your message isn't understood...it isn't effective. I welcome any feedback! Thanks!