Knowledge retention is the ability to recall and apply information learned during training after a period of time has passed. It is the true measure of whether training has been effective — not completion rates or post-course quiz scores, which only confirm that learning occurred in the moment. Organisations invest heavily in training; knowledge retention determines how much of that investment actually translates into lasting capability.
The Ebbinghaus Forgetting Curve
German psychologist Hermann Ebbinghaus identified in 1885 that without reinforcement, humans forget approximately 50% of new information within one hour, 70% within 24 hours, and up to 90% within one week. This “forgetting curve” is the single biggest challenge in corporate training — a one-day workshop delivers intense learning that evaporates within days unless deliberately reinforced.
Strategies That Improve Knowledge Retention
- Spaced repetition: Reviewing content at increasing intervals — the single most evidence-backed retention strategy
- Retrieval practice: Actively recalling information (quizzes, flashcards) rather than passively re-reading it
- Interleaving: Mixing different topics or skills in a practice session rather than blocking one topic at a time
- Elaborative interrogation: Asking “why” and “how” about new information to connect it to existing knowledge
- Application: Using knowledge in a real or simulated task — the most powerful retention driver of all
- Sleep and spacing: Distributing learning across multiple sessions with rest in between significantly outperforms massed practice
Measuring Knowledge Retention in an LMS
Standard LMS post-course assessments measure what learners know immediately after training — not what they retain over time. True retention measurement requires retesting at 30, 60, and 90 days after the training event. AI-powered platforms can automate this through spaced repetition flashcards and scheduled knowledge checks, giving L&D teams data on actual retention rather than just completion.
Beat the forgetting curve with EdzLMS
AI flashcards, spaced quizzes, and retention analytics — automatically generated from your existing course content.
See SCORM Analyser →