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First off, this belongs in the sign language and oralism forum, not in the CI and HA forum.
The negatives: CS is a phonetically based system intended to represent the phonemes and morphemes of a spoken language. A phoneme and a morpheme are, in and of themselves, free of meaning. CS does nothing toconvey contextual information, such as is conveyed in a whole language approach. Whole language approaches have been shown to provide greater reading comprehension and language fluency in both hearing and deaf children.
CS, like any other MCE, attempts to make visual that which is intended to be perceived auditorily. The auditory system processes information in a linear manner. The visual system processes information in a spatial and time oriented manner. Therefore, adding visual cues to a spoken language confuses the two linguistic systems. While individual words may be better lip read using CS, contextual comprehension is not improved due to the confusing linguisitic environment.
Few people using it is a negative, as it cannot sustain itself as a communication system unless many people use it.
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