The Forgetting Curve

Ever had that moment where you’ve met someone and two minutes later, you can’t recall their name?  Or read a passage in a book, but you can’t remember what it said?  Think of your students, how much do you think they remember after the class is done?  Would you believe they can forget as much as 80% by the day after your class?

Back in the 1800’s, Hermann Ebbinghaus, a German psychologist, did a study on how people forget what they’ve learned.  It was a limited study, but the theory has been replicated and become known as the Forgetting Curve.

The Forgetting Curve is exponential.  The student walks out of the lecture knowing 100% of the material, by the day after 50%-80% is gone!  Each day after that gets progressively worse.  By day 7, students have forgotten significant amounts of material.  A month after a lecture, students may only retain 2% – 3% of what they learned!

Graphically, the forgetting curve has been portrayed like this:


(source: )

A huge part of beating the Forgetting Curve is on the student.  Doing recall exercises the next day, ie., studying.  But as instructors, we also play a role in beating the Forgetting Curve:

-Over the duration of a course, or even during a lesson, build in repetition.  Reinforcement is a big part of beating the Forgetting Curve.  During the lesson, build in repetition, to help ensure the material is being learnt.  Then in subsequent classes, come back to it, reinforce the material and ensure that it is being retained.

-Make the lesson, and the material, memorable.  Teach the lesson in a way that students will remember it; give the lesson meaning so students know why they need the lesson, show the teaching point matters.  Deliver it in a way that works for students and will be memorable – be that a game, a story, an example, an activity.

-Share memory tricks.  Is there a mnemonic or memory device that can help to learn the material? Share it!  (How many of us still recite 30 days hath September, April, June, and November….?)

-Be clear in your teaching.  The worse piece is delivering teaching points in a way that can’t be easily followed.  If students struggle to get the material in the first place, they won’t be able to recall it later.  So ensure that the lesson you’ve created is clear TO THE STUDENT.  Too often it’s clear to the instructor, but it’s the student that matters!

Want to know more about the Forgetting Curve, and how easy it is to beat with studying, check out the University of Waterloo post:

Want to see some more ideas about how to improve delivery to beat the Curve, this post is specific to online learning (and was the inspiration for this post), but the ideas can be adopted:


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