Presentation Skills: Why Your Slide Deck Is Making You Less Persuasive

The slide deck was designed as a support tool. At some point it became the argument. That shift has made professional communication significantly worse. Here is how to reverse it.

There is a presentation format that has become so normalised in professional life that most people no longer notice how badly it communicates. A deck of twenty to fifty slides. Each slide containing two to five bullet points. A presenter reading those bullet points to an audience that can read them simultaneously and faster. An hour spent transferring information that could have been an email. This is not a presentation. It is a document with a live narrator, and it is significantly less effective than either a well-written document or a well-structured presentation would be on its own.

What Went Wrong

The slide deck was originally a visualisation tool designed to show things that words could not carry efficiently. At some point it became the communication itself. Research on presentation effectiveness consistently finds that audiences retain significantly more from presentations built around a clear narrative structure than from presentations built around information transfer via slides. The narrative structure creates a through-line that the audience can follow and remember. The information structure creates a sequence of facts that the audience can follow in the room and forget within forty-eight hours.

The Argument-First Framework

The framework I use builds the presentation in the opposite order from the one most professionals use. Start with the one-sentence conclusion: what do you want the audience to believe, decide, or do differently after your presentation? This is not the topic. It is the argument. “Our Q3 campaign strategy should shift from awareness to conversion” is an argument. “Q3 Campaign Strategy Update” is a topic. Then build the three to five points that lead to that conclusion, each one a claim that needs to be made and supported. Then and only then, identify where visual support would genuinely help. Build the slides in service of those specific moments. Delete everything else.

The Length Problem

Research from presentation design experts including Nancy Duarte suggests that most professional presentations are roughly three times longer than they need to be to make their argument effectively. The rule I apply in my courses: if you cannot make your core argument in five slides or less, you have not finished developing the argument. You have finished collecting the material. Those are different stages of the work, and conflating them is what produces forty-slide decks that leave audiences informed but unpersuaded. A presentation with a clear argument, well-supported, concisely delivered, is one of the most powerful communication tools in professional life. Most presentations are not that.

→ The Writing Lab covers the practical mechanics of professional communication including presentation structure, business writing, and pitch development. Corporate workshops on presentation effectiveness are available through the careercomms.com/work-with-me/“>Work With Me page.