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There have been many theoretical approaches to the study of intonation. Apart from other models, the history of intonational studies presents two fundamental approaches developed since 1900: the British school of intonation and the American school of intonation. The British school scholars focused on the change of pitch direction as a whole contour on a tone group, whereas the American approach analysts gave importance to pitch levels on different syllables. Halliday asserts that the importance of intonation is in its ability to give different meanings for the same utterance by changing the intonation. He proposed three systems: Tonality, Tonicity and Tone in his book Intonation and Grammar in British English (1967) and he described the three systems after analyzing as the three recites. These play different roles in English grammar but in any given utterance they operate in interaction with one another so that, it cannot always give a clear account of the meaning of a particular selection in one system in isolation from the others.