
course materials, one persistent challenge remains: learners forget
what they’ve learned — quickly. This phenomenon is not new. Over a
century ago, German psychologist Hermann Ebbinghaus discovered
the Forgetting Curve, a concept that remains profoundly relevant to
trainers today.
Understanding the dynamics of the Forgetting Curve — and how to
combat it — can make the difference between training that simply
checks a box and training that transforms performance.
What Is the Forgetting Curve?
The Forgetting Curve is a visual representation of how information
is lost over time when there is no attempt to retain it. Ebbinghaus
conducted experiments on himself to measure how much he could
remember after various intervals. The results were staggering: he
found that up to 70% of newly learned information is forgotten
within 24 hours unless it’s reinforced.
The curve starts steep, showing rapid loss of knowledge right after
learning. Over time, the rate of forgetting slows down, but the overall
loss is significant unless countermeasures — like review, practice, and
reinforcement — are applied.