Their main claim was that a particular test at the beginning of the course accurately predicted the outcome of the course in terms of their grade. Someone else mentioned that in the later papers, they say that their test is no longer predictive.
It’s possible that people are enough more used to computers that some elementary concepts (like that the computer responds to simple cues rather than having any understanding of what you mean) are much more common, so those concepts aren’t as useful for filters.
It’s possible that people are enough more used to computers that some elementary concepts (like that the computer responds to simple cues rather than having any understanding of what you mean) are much more common, so those concepts aren’t as useful for filters.