Updated March 6, 2026
Key Takeaways
- The curve of forgetting describes how quickly people lose newly learned information without reinforcement, often forgetting up to 90% within a week.
- Traditional workplace training often fails because employees rarely revisit or apply what they learn after a course ends.
- Learning strategies such as spaced repetition, active practice, and collaboration significantly improve knowledge retention.
- Cohort learning helps organizations overcome the curve of forgetting by reinforcing knowledge through social learning, real-world application, and continuous feedback.
It’s probably all too familiar: you learn something new, only to forget it faster than you can say, “I know this.” It’s frustrating – concerning even—especially in the workplace, where knowledge retention often decides whether lessons learned are applied to future projects. But why do we forget so quickly?
It turns out our brains are wired to shed new information within days or weeks unless we actively work to retain it. German psychologist Hermann Ebbinghaus formulated the Forgetting Curve Theory in the late 19th century, but it’s only recently that we’ve started to grasp its impact on, and implications for, corporate training.
Understanding the curve of forgetting is critical for modern learning and development (L&D) teams. When organizations design training without reinforcement, most of that knowledge disappears before employees ever apply it on the job.
The bright side is that once you know how the curve of forgetting works, you can actually take steps to combat it. All you need to do is provide a learning environment and training methodology that promotes real-world application, repetition, and reinforcement, like cohort-based, collaborative learning.
This article covers the science of forgetting, its cost to organizations, and why cohort learning is being used by high-performing organizations for knowledge recall and internalization.
So, here we go—no forgetting allowed past this point!
What is the Forgetting Curve?
The curve of forgetting is a learning science model that describes how information fades from memory over time when it is not reinforced or applied.
The concept was first introduced by German psychologist Hermann Ebbinghaus in the late 1800s after he studied how quickly people forget newly learned information.
Ebbinghaus discovered that memory declines rapidly after learning unless the material is revisited or practiced.
Research based on his work suggests that:
- About 50% of newly learned information is forgotten within 24 hours
- Around 70% may be lost within a few days
- Up to 90% can disappear within a week without reinforcement
This pattern became known as the forgetting curve, a simple yet powerful model explaining the natural decline of memory over time.
In corporate training environments, the curve of forgetting explains why employees often forget what they learned in a workshop or training session shortly after it ends.
How the Curve of Forgetting Works
In the late 1800s, Ebbinghaus set out to uncover a mystery that had puzzled humans for centuries: why do we forget things so quickly after learning them? Using himself as a test subject, Ebbinghaus memorized meaningless syllables and tracked how much he remembered at various intervals.
His experiments revealed a startling pattern: memory fades fast, with the sharpest drop occurring shortly after learning.
Within a day, we forget about 50% of new information, and by the end of a week, up to 90% of it vanishes. Ebbinghaus plotted this decline on a graph, and the resulting curve showed just how dramatically our memories can fail us.
This became the basis for the forgetting curve, a simple yet powerful model that explains the natural decline of memory over time.
Modern neuroscience continues to confirm Ebbinghaus’s findings. Even in today’s information-rich workplace, the brain still follows the same pattern: without reinforcement, much of what we learn fades quickly.
A study recreated Ebbinghaus’s experiments using modern tools and reached the same conclusion. In today’s world of constant information overload, our brains still follow the same relentless trajectory—without reinforcement, we forget about half of what we learn in a single day, and the added burden of stress can make that percentage even higher.
Another experiment took this further. Researchers asked participants to memorize sets of facts and then tested their recall after different points in time. The results echoed the curve of forgetting, but with a twist: when information was linked to something personally relevant or emotionally meaningful, the decline wasn’t quite as steep.
In other words, our brains are constantly deciding what information is worth remembering and what can be safely discarded.
Why the Curve of Forgetting Matters for Workplace Learning
Despite good intentions, traditional training initiatives often miss the mark, especially when it comes to long-term impact.
Many corporate training programs rely on “one-and-done” learning events, where employees attend a workshop or complete a course but rarely revisit the material afterward. This approach directly conflicts with how the brain forms long-term memory.
Without reinforcement, practice, or real-world application, employees forget most of what they learn before they can apply it to their work. This isn’t just a minor inconvenience, it can significantly affect an organization’s bottom line.
Poorly designed training programs lead to:
- Wasted learning investments
- Decreased productivity
- Slower skill development
- Missed opportunities for innovation
Organizations that prioritize effective learning strategies can see significantly higher performance outcomes. Studies show that companies investing in high-quality learning and development generate significantly higher revenue per employee than those that neglect training effectiveness.
Factors That Affect Learning Retention
So, why do we remember some things while others slip from our memory? Several cognitive and environmental factors influence whether knowledge moves into long-term memory or disappears along the forgetting curve.
Relevance and meaning
Things with relevance and meaning are easier to recall.
Learnings that have little significance to us, like the nonsense syllables Ebbinghaus studied, are much more prone to being forgotten.
For example, if you’re listening to a talk about something you don’t really understand or care about, you’ll probably forget it faster than if it were about something you find interesting or exciting. This is because meaningful information is often tied to emotions, personal experiences, or existing knowledge, making it easier for your brain to encode and retrieve later.
Emotional state and cognitive load
How we feel plays a big role in what we remember.
Ebbinghaus thought that physical factors like stress and sleep play a big role in memory formation. For many, it’s a frustrating cycle—stress makes it harder to remember, which leads to even more stress. But what exactly happens in the brain at that moment?
Research shows that stress releases cortisol, which makes it harder to form and recall memories and, ultimately, creates this frustrating loop. Sleep, on the other hand, helps the brain sort and store new information. Especially during deep sleep, the brain strengthens connections between neurons, helping us organize and retain what we’ve learned. So, rest is just as important as the effort we put into learning.
Teaching method
How we learn matters just as much as what we learn. Clear, organized explanations are easier for our brains to process and remember. Compare that to a random set of notes jotted down during a busy meeting with no apparent structure—who would remember all that?
In addition, microlearning, or breaking information into small manageable chunks, has a positive impact on knowledge retention. By focusing on one idea at a time, learners can absorb and apply concepts immediately without the risk of cognitive overload.
Repetition and reinforcement
Memory formation thrives on repetition. The forgetting curve example shows that without reinforcement, most new information fades much too quickly to reach our long-term memory—sometimes within hours.
Regular review, especially spaced over time, strengthens neural connections and makes the learnings easier to recall. One way of looking at it is to think of memory as a muscle. The more you “exercise” it with regular reviews, the stronger and more reliable those neural pathways become.
Active learning
Active learning consistently outperforms passive learning.
Instead of simply listening to information, learners retain more when they actively engage with it through problem-solving, discussion, and hands-on practice.
For example:
- Role-playing a sales negotiation
- Troubleshooting a technical issue
- Collaborating on a project
These activities engage multiple cognitive processes, strengthening memory and understanding. Viewed in this light, learning with a practical and experiential focus basically transforms training into a rehearsal for real-world success.
Why Traditional Employee Training Fails the Memory Test
Despite good intentions, traditional training initiatives often miss the mark, especially when it comes to long-term impact and measurable results.
This isn’t just a minor inconvenience; it can significantly reduce an organization’s bottom line. Poorly designed training programs lead to wasted resources, decreased productivity, and missed opportunities for growth. In fact, companies that prioritize the quality of their L&D training provisions generate twice the revenue per employee compared to those who neglect it. That’s a considerable advantage to leave on the table!
So, why do so many companies miss out on the full value of their training investments? Why do their L&D solutions fail the “memory test,” letting critical skills fade before they’re ever applied?
- A lack of focus: Many training programs cover too much or focus on the wrong things. For instance, teaching abstract theories without connecting them to real work scenarios wastes time and resources. Training should always align with critical skills that drive business success.
- Low engagement: Sitting through dry, one-size-fits-all training sessions is a fast track to boredom. People learn in different ways—some prefer visual aids, while others thrive in hands-on environments. Without interactive, varied approaches, it’s tough to keep employees invested.
- Poor retention: Even when training is engaging, it doesn’t always stick. If learners don’t apply what they’ve learned quickly or revisit it, the forgetting curve takes over. Regular testing and opportunities to practice are crucial for long-term memory.
- No collaboration: This one’s a big one—learning is social! Without collaboration, training feels isolated and forgettable. Sharing insights, solving problems together, and learning as a group makes it far more memorable.
Luckily, there’s a way to counteract these common pitfalls and make workplace learning as impactful as it can be. The power lies in the cohort.
Fighting the Curve of Forgetting: The Cohort Learning Solution
Traditional training methods often lead to skill erosion and knowledge gaps, but cohort learning helps address these challenges.
Unlike isolated learning experiences, cohort learning immerses participants in a collaborative learning journey where they progress through content together.
Participants engage in:
- Group discussions
- Collaborative projects
- Real-world problem solving
- Peer feedback
This creates a dynamic learning environment that encourages accountability, engagement, and repeated interaction with key concepts.
Intrepid by VitalSource is a learning platform designed to help organizations turn learning into performance through practice, collaboration, and personalized coaching powered by humans and AI.
Rather than relying on passive content delivery, the Intrepid platform emphasizes real-world assignments, peer collaboration, and feedback that reinforce learning over time.
How Cohort Learning Improves Knowledge Retention
One cognitive framework often used to design effective learning experiences is the AGES model, which highlights four elements that strengthen memory formation. AGES stands for:
- Attention: Keep learners engaged with focused, interactive activities that eliminate distractions.
- Generation: Ask learners to generate their own insights to deepen their understanding and make the learnings more relevant to their personal experience.
- Emotion: Emotional connections, like a sense of achievement or excitement, can anchor memories and make them more retrievable. Tap into strong emotions for stronger memories.
- Spacing: Timing matters. Deliver lessons over time to build deeper, more durable memory pathways. Spaced repetition strengthens memory far better than cramming!
Together, these elements help move knowledge from short-term memory into long-term retention.
But how does the AGES model actually play out in the process of memory formation? Let’s explore how these principles come to life in effective cohort learning programs.
The Cohort Advantage
Collaboration
Retention improves when learning is social. Cohort learning leverages collaboration to deepen understanding and reinforce memory by encouraging active participation. Intrepid’s platform fosters this with tools like discussion forums, real-time chat, and peer reviews.
These features help learners exchange ideas, clarify concepts, and embed new knowledge in shared experiences. That’s the foundation of a strong learning community.
Engagement
Learner engagement hinges on creating meaningful, human-centric experiences. We focus on interactive content delivery to keep learners immersed. Gamified rewards, such as points and badges, celebrate progress and make motivation a natural byproduct. And to enhance connection and collaboration, real-time virtual events allow learners to share their knowledge with others and build relationships that extend beyond the course.
Motivated learners aren’t just participants—they’re problem solvers and innovators. They take what they’ve learned and use it to spark change.
Application
When employees get the opportunity to apply what they’ve learned, they’re much more likely to make real progress. There’s simply no substitute for hands-on experience. That’s why we integrate practical application into every step of the journey with:
- Scenario-based projects: Helps learners solve real-world challenges in a team effort.
- Role-play exercises: Offers a safe space to practice skills in a realistic setting, with AI-driven interactions to simulate dynamic conversations and scenarios. Learners can practice responding to real-world situations and receive personalized feedback from the AI, making the experience more interactive and scalable.
- AI-driven feedback tools: Provides immediate, actionable insights to improve performance, reinforcing skills learned through role-playing and practice exercises.
So, if you’re looking to create a more a impactful learner experience, consider incorporating these application-focused elements.
Meaningful Learning That Lasts
Ebbinghaus’s forgetting curve highlights a simple truth: without reinforcement, most workplace training fades fast.
To create lasting impact, organizations must design learning experiences that actively counter the curve of forgetting.
Cohort learning offers a powerful solution by combining:
- Social collaboration
- Continuous reinforcement
- Real-world practice
- Structured learning journeys
When learners share ideas, practice skills, and revisit knowledge together, retention improves and so does real-world performance.
For organizations seeking to build lasting capability, the goal is not simply delivering information, but creating learning experiences that turn knowledge into action.
Ready to create learning experiences that stick? Explore how cohort learning can transform your training programs and drive better business outcomes.
Frequently Asked Questions About The Forgetting Curve
What is the Forgetting Curve?
The curve of forgetting is a model developed by Hermann Ebbinghaus that illustrates how quickly people forget new information without reinforcement. Research shows that much of what we learn can disappear within days if it isn’t reviewed or applied.
Why is the Forgetting Curve important in L&D?
Understanding the curve of forgetting helps organizations design learning programs that reinforce knowledge over time, improving retention and performance.
What causes the curve of forgetting?
The curve of forgetting occurs because the brain naturally discards information that it does not revisit or apply. Without reinforcement, practice, or emotional relevance, new knowledge remains in short-term memory and fades quickly. Factors such as lack of repetition, low engagement, stress, and passive learning methods can accelerate the rate at which information is forgotten.
How does cohort learning help with knowledge retention?
Cohort learning encourages collaboration, discussion, and hands-on practice. These experiences reinforce learning and make it easier for employees to remember and apply new knowledge.
How can organizations overcome the Forgetting Curve in training programs?
Organizations can reduce the effects of the forgetting curve by incorporating:
- spaced repetition
- active learning
- real-world practice
- collaborative learning experiences
These strategies strengthen memory and improve long-term skill development.
How does practice-based learning affect retention?
Practice-based learning improves retention by giving learners opportunities to apply new knowledge in realistic scenarios. Activities like role-play exercises, scenario-based projects, and collaborative problem-solving engage multiple cognitive processes and reinforce memory. When learners practice skills instead of only consuming information, the knowledge becomes easier to recall and apply in real-world situations.
