Theoretical summary integrating recent studies demonstrating a failure of the Testing effect and Generation effect in situations where Element interactivity is high. They extrapolate to suggest that Desirable difficulties, after Bjork in general may be undesirable when element interactivity is high, by reasoning in terms of Cognitive load theory and working memory availability. This logic may also explain the Worked example effect.
See e.g. van Gog, T., & Sweller, J. (2015). Not New, but Nearly Forgotten: The Testing Effect Decreases or even Disappears as the Complexity of Learning Materials Increases. Educational Psychology Review, 27(2), 247–264 for a review of the broader issue being explored here.
Senior author: John Sweller