Depends on the audience. I've seen presentations to Director-and-VP types that wouldn't progress past the first (fact summary) slide. You'll present a nice summary of your results with the high level conclusions, and someone will open their mouth and say "Well, what about Detail X that I heard about? How did you account for that?" and you say "We'll get to that, it's actually explained on slide 6." "Well, I heard through Dave that..." now you have to either discuss it immediately without the slide's context, or awkwardly scroll to slide 6 for the guy. Then some other exec pipes in with "But, my team's component Y was not included here at all!" and you say, "That's slide 3. I was planning on that being my first topic, but we got side tracked with Detail X..." Then the original exec "Speaking of Detail X, what about SubDetail Z, which I notice you left off [the summary slide]..." Uggghhhhh kill me now.