More Bad News for Slideware Users
A study from Universitat Autònoma de Barcelona in Spain confirms the conclusions of a study from Purdue University I wrote about a couple weeks ago.
Like the Purdue study, the Barcelona results are bad news for the 40 million people each day who deliver “standard” slideware presentations.
Their slides are getting in the way of the communication process, leading to lower understanding and retention by the audience.
However, the study indicates that presenters can achieve better outcomes by turning off the projector, talking to their audience, and using a chalkboard, whiteboard or flip chart when needed.
205 Students in Four Classes
Researchers conducted their study with a base of 205 students registered in a course entitled the Psychology of Education during the 2010-2011 academic year—a compulsory course for those working toward a bachelor’s degree in psychology.
The course was divided into four groups and led by two professors. Each professor taught one course in the morning and one in the afternoon. For this test, each professor used slides for one class and a blackboard for the other.
The two professors worked together to develop a 19-slide presentation for the class in which slides would be shown. The number of lines in each slide did not exceed 13. The number of words per slide varied between 42 and 93.
This is actually a “light” treatment of the use of slides by industry standards (as this page of conference handouts clearly demonstrates).
The professors prepared a 10-question multiple-choice test to evaluate the knowledge acquired by students during the class. The test was administered immediately after the presentation. The questions and their correct answers were based on information taught during the class.
During the first 40 minutes of class time, the professor delivered the presentation (lecture). The remaining time was devoted to allowing students to complete the quiz.
Results Are Significant
There is no question that slides impeded the communication process. The students who weren’t exposed to slides scored higher on the quiz than those who were.
The average score for those who didn't see slides was 8.21. The average score for those who were exposed who did see the slides was 6.73.
In other words, eliminating slides enabled students to score 22 per cent higher on the quiz.
“The evaluations of contents presented without PowerPoint yielded better results (more correct answers and consequently fewer mistakes) than when the same contents were presented using the PowerPoint methodology,” the researchers concluded. “If we take the class taught without PowerPoint as a reference, the effect of this technology used according to the procedure described is to lower learning by 18%, which can be considered a significant effect (or defect).”
Verifying Step Three: Minimize Visual Aids
The researchers are verifying step three of the 5 Steps to Conquer ‘Death by PowerPoint’: Minimize visual aids.
If presenters need a visual to explain a concept, they should use a visual (and, as the Purdue study indicated, there is no added value to developing a slide versus simply drawing a diagram with a whiteboard or flip chart). Once it’s no longer needed, remove the visual from view and talk to your audience.
But if presenters feel compelled to always have something in front of the audience, they are negatively impacting their ability to communicate effectively.
For those who believe that communication, understanding and retention are important to their personal and/or professional business success, there is a lot to be gained from the Barcelona study.