The forgetting curve is the shape memory takes after learning something: a steep drop in the first day or two, then a long flattening. Most of what is lost goes quickly, and what survives that first period survives for a long while. Reviewing the material resets the curve, and each review makes the next decline shallower — which is why retention depends far more on what happens after a training day than on how good the training day was.
You have paid for training that changed nothing. Everyone has. The room was engaged, the feedback forms were good, and six weeks later the business was being run exactly as it had been the week before. That is not a failure of the trainer or the team. It is the default behaviour of memory, and it is predictable enough to plan around.
Where the model comes from
Hermann Ebbinghaus, working in the 1880s, tested his own memory on lists of nonsense syllables and plotted how much he could recall over time. The curve he described is steep at first and then flattens out. The second half of his work is the useful half for a business owner: reviewing the material resets the curve, and repeated review flattens it further each time.
So retention is not a function of how good the original session was. It is a function of how many times the material gets pulled back out afterwards.
Why it matters to an owner
Because you are buying the wrong thing. When you book a training day you are buying attendance. What you actually want is a change in behaviour still visible in three months, and nothing on the invoice covers that part.
The same applies to everything you tell people once. The induction. The new procedure explained at the team meeting. The pricing rule you were clear about in March. “We covered that” is technically true and commercially useless: if it was covered once and never revisited, the curve says most of it went within days, and what survived is whatever happened to get used immediately.
It applies to you as well, and this is the part owners skip. The book you read last year, the conference, the two-day course. Ask what you actually changed as a result. If the honest answer is nothing, you did not fail to understand it. You never went back to it.
What actually makes it stick
Four things flatten the curve, and none of them is a better training day.
Retrieval
Pulling the information out of your own head is what strengthens it. Being shown it again is a different act and does far less. That is why a ten-minute conversation in which people explain the idea back beats an hour of re-presenting it — and why almost every review meeting is run the wrong way round.
Spacing
Reviews spread across weeks beat the same total time spent in one block. A day of training followed by four short reviews will outperform two days of training, and it costs less.
Use within 48 hours
Anything applied to a real job in the first two days survives. Anything waiting for the right opportunity is gone before the opportunity arrives. If there is no chance to use it that week, the timing of the training was wrong.
Consequence
If nothing is measured and nobody follows up, the business has communicated that the training was optional, whatever was said in the room. People read that signal accurately and they read it fast.
A worked example
Illustrative figures. A firm sends six salespeople and two managers on a one-day sales course. The fee is £2,400, and eight people are off the tools for a day, so the real cost is comfortably north of £5,000 once lost output is counted.
The day goes well. Two weeks later, conversion is unchanged. Six weeks later, one person is using the new questioning structure, and it is the person who was already strongest. The owner concludes that training does not work here — the wrong conclusion drawn from correct evidence.
Run the same day with a reinforcement plan attached and the sequence looks like this. Day 2: fifteen minutes at the team meeting, and not a recap from the manager — each person says out loud the one thing they will use this week. Day 10: each salesperson brings one real call where they tried it and it did not go to plan. Day 30: the manager sits in on two calls each and gives one piece of feedback against the structure rather than a general review. Day 60: one number is reviewed — proposals per enquiry, conversion, or average order value — chosen before the training day, not after.
Total reinforcement is around three hours across two months, spread over eight people. Against a five-thousand-pound spend, that is the cheapest part of the exercise and the part that decides whether the money did anything.
How to use it this week
- Take the last thing you trained and diarise three reviews. Day 2, day 10, day 30. Ten to fifteen minutes each. Put them in now, before the diary fills.
- Make people retrieve, not listen. Ask them to explain it back or bring an example of using it. Re-presenting the slides feels like reinforcement and does far less.
- Cut what you are embedding to one thing. A day containing forty ideas embeds none. A day containing one embeds one.
- Move it out of memory and into the process. A checklist, a template with the fields already there, a form that will not submit without the step. Design beats recall.
- Make the line manager reinforce inside 48 hours. Whoever runs that person day to day is the only real reinforcement there is.
- Do not book the next course until the last one is embedded. A training budget with no reinforcement habit buys the same lesson repeatedly.
The underlying mistake is treating training as an event with a cost rather than a process with a cost. The invoice is for the day, so the day gets managed. The follow-up is free, so it gets dropped — which means the paid part is regularly wasted to protect three hours nobody wanted to spend.
Questions to ask yourself
- Out of 10, how much of your last training spend is still visible in how people work?
- What have you explained more than three times, and what does that tell you about the process rather than the person?
- What did you personally learn in the last year that you have never gone back to?
- Which of the things you rely on people remembering could be built into a template or a checklist instead?
Where this fits in coaching
This model underpins the self-leadership side of our personal coaching, and it is the reason coaching is spaced across months rather than delivered in one hit. Anything worth knowing gets forgotten on a predictable schedule, so the only defence is going back to it deliberately, before you need it. Read it with 5 Star Coaching, where the fifth move is the reinforcement, and The 5 A’s of Change, where adoption is the stage this curve keeps eating.
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Frequently asked questions
Does this mean training days are a waste of money?
No. It means the day on its own is roughly half a purchase. The session creates the peak; what happens in the following month decides how much of it you keep. A one-day course with three short reviews attached will beat a two-day course with none, at lower cost and less time off the tools. So the practical change is not to stop training, it is to stop buying training without a reinforcement plan already in the diary. If a provider cannot tell you what the day-2, day-10 and day-30 follow-up looks like, budget for building it yourself before you book.
Why does explaining it back work better than being shown it again?
Because the effort of remembering is the thing that strengthens the memory. Being re-presented with material feels productive and familiar, which is exactly the problem: recognition is easy, so almost no work is being done. Pulling the idea out of your own head is harder, occasionally embarrassing, and considerably more durable. That is why the most useful fifteen minutes after a training day is each person saying out loud what they will use this week, rather than a manager running through the slides again. Run your review meetings as questions rather than recaps and you get the benefit for free.
How does this apply to me rather than my team?
Identically, and owners are the worse offenders because nobody reinforces them. Count the books, conferences and courses you have consumed in the last two years, then count the ones that changed a decision you made. The gap is not comprehension, it is the absence of any return visit. The fix is the same as for the team: pick one idea, use it inside forty-eight hours on something real, and revisit it deliberately at day 10 and day 30. This is one honest argument for regular coaching over an intensive workshop, because the return visit is built into the rhythm.