Managing Deck Length

The executive deck is 10-15 slides plus appendix. If it is longer than 15 slides, it has not been edited. This is not a judgment about the complexity of the content — it is a judgment about the presenter's ability to decide what matters. A 40-slide deck is a thinking problem that has been formatted as a slide problem. The solution is not to reduce font sizes or use two-column layouts — it is to decide which stories belong in the main deck and which belong in the appendix.

The appendix is not where slides go to die. It is organized supporting evidence that the main deck can reference. Each appendix slide has a specific relationship to a main deck slide. "For detailed methodology, see Appendix B" on slide 6 means the CFO who needs the methodology can find it immediately. The appendix is unlimited — it holds everything the main deck cannot contain without becoming too long to present.

1. Build the full draft without length constraints Write every slide you think the deck needs. Do not edit during drafting. You will produce a 35-50 slide draft. That is the right starting point. The draft represents every argument and every piece of evidence. Now edit.
2. Apply the arc filter For every slide, ask: does this slide belong to Setup, Insight, or Action? If yes, keep it in the main deck. If no, move it to the appendix. This single filter eliminates 30-40% of most decks.
3. Apply the one-story filter For every slide that survived the arc filter, ask: does this slide tell exactly one story? If the slide has multiple conclusions, split it. If one of the conclusions belongs to a different part of the arc, move that conclusion to the right section or to the appendix.
4. Apply the redundancy filter Look for slides that make the same point as another slide in different visual form. This is common in first drafts — the presenter makes the same argument twice because they want to be sure it lands. Keep the version that makes the argument most powerfully. Move the other to the appendix or delete it.