Performance-Learning Dissociation

The performance-learning dissociation is Bjork's most consequential finding for institutional design: measures of immediate performance (test scores during training, practice-session accuracy, subjective fluency, trainer satisfaction ratings) are inversely predictive of long-term retention and transfer. Students who perform best during massed, blocked, reception-heavy practice perform worst on delayed tests requiring independent application. Students who struggle during spaced, interleaved, generation-requiring practice perform best on later assessments. The dissociation arises because performance during training tracks current retrieval strength (high after massed practice, low after spacing-induced forgetting) while learning tracks storage strength (built through the effortful retrieval that spacing requires and that massing eliminates). Organizations and schools that evaluate during training rather than after delay systematically select for the conditions producing the weakest learning.