The Assertion -Evidence Structure for PowerPoint Slide Design

Introduction to PowerPoint Presentations

  • General consensus: Most people consider PowerPoint presentations to be ineffective.

  • Common belief: Individuals often assume basic computer skills equate to skillful PowerPoint use.

  • Reality: Creating effective slides requires time, effort, and knowledge of multimedia learning theory.

Assertion-Evidence Structure (AES)

  • Developed by: Michael Alley and colleagues at Penn State University.

  • Purpose: A model for structuring slides to enhance effectiveness.

  • Overview:

    • Examining weaknesses of standard slide layouts.

    • Discussing contributions from multimedia learning theory and cognitive psychology.

    • Introducing the Assertion-Evidence Structure to improve slide design.

Common Issues with Traditional PowerPoint Slides

  • Predominant structure: Topic-Bullet point structure prevalent in many presentations.

  • Example of ineffective slide: Topic about business valuation presented in a text-heavy format.

  • Aesthetic improvements proposed: Use relevant images, proper formatting, and highlight important information.

Default PowerPoint Layouts

  • Origin: PowerPoint, created in 1983, aimed to replace overhead projectors but retained their defaults.

  • Pervasiveness of topic-subtopic structure:

    • 59% of industry and government presentations use topic-subtopic layout.

    • 63% of professional conference slides utilize this method.

    • 71% of student presentations also follow this format.

Problems with Text-heavy Slides

  • Excessive text leads to several issues:

    • Text can dilute thought.

      • Reference Article: Harvard Business Review (1998) published that bullet lists can reduce cognitive processing complexity and thought clarity.

    • Bullet points communicate limited relationships (sequence, priority, membership):

      • Ineffective for complex information presentation.

      • Fails to illustrate nuanced relationships among ideas.

    • Audience distractions:

      • Presenters mirror text-reading; dilutes engagement.

      • Cognitive overload: Concurrent reading and listening processes engage the same cognitive resources.

      • Research shows performance drops with simultaneous text and speech compared to singular modalities.

      • Example Study: Conducted by Slava Kalyuga in Applied Cognitive Psychology demonstrated that simultaneous information delivery reduces retention.

      • Outcome: Presence of both written and spoken information overwhelmed participants' language processing capabilities.

Assertion-Evidence Structure (Detailed Overview)

Benefits of AES

  • Supports complex information relationships; enhances audience engagement and retention.

  • More effective than traditional topic-bullet structures.

Characteristics of AES

  1. Assertion Headlines

    • Use complete sentences, presenting a full assertion rather than a vague summary (e.g., "The iPhone has received four major updates since its introduction in June 2007").

    • Example comparison: Transition from vague topics to assertive headlines leading directly to the main idea improves clarity and understanding.

    • Study reference: Technical Communication (2006) showed improved student recall due to the simple change in slide headlines.

  2. Visual Evidence

    • Slide bodies must visually support the assertions with evidence (graphs, timelines, images).

    • Example: A timeline displaying the evolution of iPhone models alongside their launch dates and images enriches audience understanding.

  3. Purposeful Animation

    • Any slide animations should facilitate comprehension, not detract from it.

    • Example: Animation illustrating the growth of the Autobahn in correlating with Germany's territorial expansion aids in understanding historical context.

Implementation of the Assertion-Evidence Structure in Presentations

Slide Construction Guidance:

  • Limit text boxes to a maximum of two lines, forcing presenters to distill key points effectively.

  • Ensure visual evidence directly supports the Assertion made in the headline, enhancing the argument or claim.

  • Example of ineffective visual evidence: A picture of a modular building does not substantiate claims without data illustrating cost-effectiveness.

Creating Effective Assertion Headlines

  • Transition from weak topics (e.g., “The Importance of Bread”) to assertive claims (e.g., “Bread serves as the handle for a peanut butter and jelly sandwich.”).

  • Importance of clarity: Ensure audiences receive answers they seek without ambiguity.

  • Development process: Creating effective Assertion headlines may require revisions to achieve clarity and succinctness (e.g., the headline for this presentation revisions).

Importance of Visual Evidence

  • Ensure visual evidence unambiguously supports assertions.

  • Creativity in visual representation may be necessary when existing visuals do not adequately support the claims being made.

  • Examples of effective visuals: Charts illustrating supply chains or statistics indicating consumer complaints which directly correlate with the assertions of the slide.

Summary and Conclusion

  • Understanding the failures of the typical PowerPoint structure is essential for improvement.

  • Application of research from cognitive psychology and multimedia can enhance the effectiveness of presentations significantly.

  • The Assertion-Evidence Structure can be effectively adopted to create clearer, more impactful presentations.