From this, for some reason, the researchers decided that the second half of 3rd grade was a great time to change everyone's writing to cursive (which, as the researchers pointed out, basically means putting all other aspects of written English on hold in order to go back to scratch and start all over again with the ABC.) An even more logical next step, though, would be to wonder why any age-group at all should be required to spend time on what amounted to an exercise in vocabulary-stunting (not that cursive in itself is bad for your vocabulary but you're unlikely to increase your vocabulary while that and other things have been put on hold for the sake of changing your handwriting style. The fact that the vocabulary-stunting effect was worst for those who'd been changed to cursive the earliest can -- as the researchers noted -- be at least partly explaned by the fact that any educational damage has worse effects when imposed on younger, more impressionable, more ignorant students.