A number of investigators have suggested that young children, even those do not
yet represent the phonological forms of words in their spellings, tend to use different
strings of letters for different words. However, empirical evidence that children possess
a concept of between-word variation has been weak. In a study by Pollo, Kessler, and Treiman (2009), in fact, prephonological spellers
were more likely to write different words in the same way than would be expected on the
basis of chance, not less likely. In the present study, preschool-age prephonological and
phonological spellers showed a tendency to repeat spellings and parts of spellings that
they had recently used. However, even prephonological spellers (mean age 4 years, 8
months) showed more repetition when spelling the same word twice in succession than when
spelling different words. The results suggest that children who have not yet learned to
use writing to represent the sounds of speech show some knowledge that writing represents
words and should thus vary to show differences between them. The results further suggest
that in spelling, as in other domains, children have a tendency to repeat recent
behaviors.