It can take a lot of time to get your presentation slide just right. However, once you got to that point, it should be super quick to recreate it. You can call this a ‘live test’. Take pen/paper, or open SlideMagic, and create the chart on the fly while someone is watching and listening. “We have 3 options, each has distinct pros and cons, I think number 2 is the best one”. If you are struggling to do this quickly and in a logical flow, your chart is probably too complex to be understood by a live audience. This is similar to a school teacher using the blackboard in the proper way.