When you give a talk or presentation, make sure that you are asking for written feedback at the end. Hand out a formal evaluation form which includes space for attendees to write comments. Encourage them to write comments by requesting that they do so. Once you have the comments, read through them. You’ll get valuable advice on how to improve your talk, information on what else they might be interested in, and you’ll also get statements or quotes you can use as testimonials for this presentation. So, from one evaluation form, you get three pieces of useful business data which you can leverage to your advantage.