Read the text below and answer question 21.

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 fi eld over general linguistic abstraction."

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

A professor at a Federal Institute is designing an English module for "Civil Engineering" students. Based on the principles of Hutchinson and Waters, presented in the text, the selection of materials for this course should primarily reflect which underlying ESP principle?