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Interleaved Testing

Optimizing the learning by modulation of the number of tests in between lessons.

An essential aspect of learning is when the learner puts to test their predictions and verifies them based on the upcoming feedback.

It has been shown in several studies that introducing interleaved tests throughout the learning process improves the learning experience significantly compared to when no questions are presented during the span of learning.

Additionally, the quizzes during and after the learning process facilitate the recollection and retention of the learned material.

The researchers have recommended that optimized learning efficiency is achieved when the ratio of lessons to tests is modulated by around 50%, and tests are presented in between the lessons interleavingly.

At this rate, the learners arrive at a maximally optimized rate in refining their predictions over the course of learning.

Interleaved Testing

The immediate and delayed recall rate of memorized information, after 5 minutes and 1 week respectively, as a function of the implemented test ratio. As the two diagrams suggest, information is best retained after one week when the ratio of test to study was maximized.

  1. Butler, E. A., Egloff, B., Wilhelm, F. H., Smith, N. C., Erickson, E. A., & Gross, J. J. (2003). The social consequences of expressive suppression.

  2. Dehaene, S. (2023, July 07). How We Learn: Why Brains Learn Better Than Any Machine

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