 They worked on a theory-based course redesign of introductory statistics as a means of developing and testing what they called the "practicing connections hypothesis".According to this hypothesis, extensive and deliberate practice applying core concepts and representations of a domain to increasingly complex problems throughout a course will result in knowledge that is more coherent, flexible and transferable.They published the first version of an interactive online textbook based on the approach in 2017, and the first paper to come from this collaboration in 2018.