Still wondering whether "the whole is greater than the sum of its parts"? Well then read this, now:

Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a total mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.

psycholinguistic guessing game

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[Excerpts from Wickipedia] In 1967, Ken Goodman wrote a widely-cited paper chiding educators for attempting to apply unnecessary orthographic order to a process that relied on holistic examination of words. Goodman posited the existence of three "cueing systems" that regulate literacy development (graphophonemic, semantic, syntactic), related to the linguistic domains of phonetics, semantics, and syntax respectively. According to Goodman, these systems overlap and work in tandem to help readers "guess" appropriately. He emphasized that pronouncing individual words will involve the use of all three systems

Goodman, K. (1967). Reading: A psycholinguistic guessing game. Journal of the Reading Specialist, 6, 126-135.