He found that they were resistant to deducing the hypothetical, to speculating about what might be, and he found finally that they didn't deal well with abstractions or using logic on those abstractions.
Han oplevede at de var imod at udlede det hypotetiske, at spekulere over det der kunne ske, og han oplevede til slut at de ikke håndterede abstraktioner godt eller at bruge logik på disse abstraktioner.