Every year, organizations pour billions into corporate Training. Slick slide decks. Polished e-learning modules. Full-day workshops with catered lunches. And yet, research consistently shows that employees forget up to 70% of new information within 24 hours — and nearly 90% within a week.
The problem isn’t effort or budget. It’s that most training is designed around what’s convenient to teach, not around how the human brain actually learns, encodes, and retrieves information.
This blog draws on decades of cognitive psychology and learning science to answer the question every L&D professional should be asking: what does it actually take for training to stick?
- 70% of training content is forgotten within 24 hours without reinforcement (Ebbinghaus Forgetting Curve)
- 6× more likely to remember content encountered through active recall vs passive reading
- 40% improvement in knowledge retention when training is spaced over time vs delivered in one session
Additional Read:
7 Signs Your Organization Needs a Smarter LMS
Why Most Training Fails Before It Begins
German psychologist Hermann Ebbinghaus experimented on himself in 1885 using nonsense syllables to demonstrate how fast he could forget them and how the Forgotten Curve was created. The Forgotten Curve is one of the best-validated and established findings in cognitive psychology.
The Forgotten Curve is harsh and indicates that without active reinforcement, memory loss happens exponentially. The first 24 hours are often the most critical for losing memory. The brain will only remember concepts it has used and prunes out everything else. Memory consolidation takes place during sleep; therefore, if you don’t review a concept prior to going to sleep, that concept will be all but lost.
There are clear implications for the corporate world regarding training employees; a one-day workshop that doesn’t include any reinforcement presents little value and is basically a waste of your company’s money. In order to transfer facts to long-term storage, the brain requires periodic repetition, time between sessions, and actively recalling the information you’ve learned.
7 Psychological Principles That Make Training Actually Stick
1. Spaced Repetition: Spread Learning Over Time
The “spacing effect,” first documented by Ebbinghaus and confirmed by hundreds of studies since, shows that distributing learning over time produces dramatically stronger memory than massed practice (cramming). Each time you revisit material just as you’re about to forget it, the memory trace strengthens. For corporate training, this means multi-session programs always outperform one-and-done workshops. Even sending a 5-question quiz three days after a course can double retention.
2. Tested Recall: Learning Through Assessment
A robustly confirmed finding in cognitive psychology is that the “testing effect” (the process of trying to remember something – even if you fail) creates a much stronger memory than simply rereading or watching the same material again. In addition to assisting in evaluating the student, quizzes, scenario-based challenges, and self-tests also endorse the learning itself. Training programs that frequently employ low-stakes retrieval processes consistently exceed those that do not employ such practices.
3. Managing cognitive load: Have less means more
Research has shown that working memory has a defined limit to the capacity of individuals’ ability to actively hold multiple bits of information in their conscious minds (Sweller, 1988), and overloading it will result in failure to learn. Chunking is the antidote — take complex material and make it smaller, arrange it into logical sequence, and remove any unnecessary elements on the screen that consume mental resources. Good design of training considers cognitive bandwidth, not just the amount of content.
4. Memory and Emotion: How Does Emotion Impact Memory?
The amygdala is the area of your brain responsible for processing emotion, and it is involved in memory consolidation. When information has emotional value to it, it’s processed more thoroughly and sent into long-term memory. This is why real-world customer failure stories remain in your mind when compliance slides do not. Those who are successful consistently make connections between the content and personal significance, employment opportunities and meaningful life experiences, with results greater than simply providing factual information. If you want learners to retain knowledge, make sure they are feeling something.
5. Mixing Different Topics Or Skills Can Help You Keep More Information In Your Long-Term Memory.
It’s counterintuitive, and feels easier; however mixing topics and/or skill types during the same practice can allow you to establish, long-term, a better memory for them. This effect is called interleaving, and it works because diverse amounts of practice make your brain work harder to determine which strategy/concept will be utilized in the same scenario. Therefore, you’ll build more flexible and transferable knowledge as opposed to applying it to specific, similar, situations/contexts.
6. Social Learning: We Learn by Watching and Teaching
Social Learning Theory, developed by Bandura, suggests that humans learn effectively by observing and imitating other people, especially when there is an emotional connection with the person being imitated (a peer). Studies show that the best way to learn is by teaching others; when an employee teaches a colleague a particular concept (known as the “protégé effect”), their understanding and retention of that knowledge increase dramatically. Using peer discussion, mentoring or sharing knowledge within training programs takes advantage of one of the oldest ways human beings learn: on a social level.
7. Elaborative Interrogation: Ask “Why?” More Often
When learners are prompted to explain why a fact is true, or how a concept connects to something they already know, retention improves significantly. This technique — elaborative interrogation — works by forcing the brain to build richer, more interconnected memory networks rather than storing isolated facts. Instead of “remember that X causes Y,” prompt learners to explain “why does X cause Y, and where else have you seen this pattern?” The explanation is the encoding.
Stop Designing Training for Delivery. Design It for Memory
The difference between training delivered and training remembered is not due to technology or budget constraints, but rather a lack of adequate design based on how people actually remember.
When you build designs around the Forgetting Curve, actively retrieve information, space repeats over time, build in emotional relevance, and manage cognitive load, then the training you are providing is not just content but rather building a change in knowledge that takes place over time.
This is the fundamental difference between a training program that is simply completed vs. a training program that actually changes people’s work habits. This gap is closing fast and organizations with an early lead will achieve a significant, compounded advantage that will be extremely difficult for others to duplicate.
