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ESP is not a matter of teaching 'specialized varieties' of English. The fact that some language features may be more statistically common in a particular context does not create a new form of language. Rather, ESP is an approach to language learning which is based on learner need. The foundation of ESP lies in the question: 'Why does this learner need to learn a foreign language?'. Consequently, the design of a syllabus for a Civil Engineering module must prioritize the communicative demands of the professional field over general linguistic abstraction."

HUTCHINSON, T.; WATERS, A. English for Specific Purposes: a learning-centered approach. Cambridge: Cambridge University Press, 1987. p. 19.