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The need for people to communicate with each other has existed since we first walked upon this planet. The lowest and most common level of communication modes we share are movements and gestures independent, that is, they permit people who do not speak the same language to deal with one another. The next higher level, in terms of universality and complexity, is spoken language.Most people can speak one language, some two or more. A spoken language is a very efficient mode of communication ifdoi:10.1007/978-1-4842-0847-2_11 fatcat:cz6pd4xrnnhx3eqko2ejihessq