We forget things.

That is not a failure of the learner or necessarily a failure of the training. It is just part of how memory works.

The Forgetting Curve is a way of describing how quickly information can fade when we learn something once and then never return to it. The idea dates back to the work of psychologist Hermann Ebbinghaus, but the practical takeaway is still useful today.

Learning something once is not the same as retaining it.

What Is the Forgetting Curve?

The Forgetting Curve describes a fairly intuitive pattern.

Shortly after learning something new, we may remember it pretty well. As more time passes without using or reviewing that information, more of it becomes difficult to recall.

The steepest drop often happens relatively soon after learning. After that, forgetting continues more gradually.

The exact amount someone remembers will vary. The subject matters. The learner matters. Prior knowledge matters.

The curve is not a countdown clock where everyone forgets the same percentage of information on the same day. The important part is the broader pattern.

If something matters, assuming a learner will remember it indefinitely after one training session is probably not a great plan.

Training Should Account for Forgetting

A lot of training is still designed as a single event.

Take the course, pass the assessment, check the box, then move on.

That works well for documenting that training happened, but it does not necessarily reflect what happens to the learner afterward. If they do not use the information for weeks or months, some of it is going to fade.

That becomes particularly important with skills that may only be needed occasionally. Someone might learn how to handle a difficult conversation today and not actually face one for three months. By then, the details may not be nearly as fresh.

Repetition Interrupts the Pattern

Reinforcing material is the key.

Each time learners revisit something, they get another opportunity to recall what they learned and reinforce it. That might mean a short refresher, another practice scenario, a quick knowledge check, or an opportunity to apply the skill again.

The goal is not necessarily to repeat the exact same course from beginning to end. In fact, that may be one of the least appealing ways to do it.

Reinforcement can be shorter and more focused. It can target the pieces that matter most or ask learners to use the same skill in a different situation.

That makes repeated training part of the learning process instead of something people only return to because a calendar reminder told them to.

Repetition Should Add Something

There is an obvious catch.

If your answer to forgetting is simply asking someone to sit through the same boring training every few months, you may technically be reinforcing the material, but you are creating a different problem.

People need a reason to engage with it again.

A refresher can introduce a new scenario. Practice can get harder. Feedback can focus on something different. Learners can revisit the skill without feeling like they are starting from zero every time. Training is much easier to repeat when the experience is actually worth repeating.

That is where the Forgetting Curve becomes more than an interesting concept.

If we know people are going to forget, then reinforcement should not be an afterthought. It should be part of how the training is designed from the beginning.