There are various scholar definitions of communication strategies as follows:
Chomsky (1965) defined views language acquisition as unique and separate from other knowledge systems, and it investigates how the internal language system develops in the mind of the individual.
Atkinson & Shiffrin (1968) defined cognitive theory sees learning as an active, constructivist process, in which students encode incoming information, relate it to their previous experience, and store a personally constructed input.
Canale & Swain (1980) defined that it relates more to learners’ ability to use strategies to compensate for imperfect knowledge and not to acquire more information.
Wenden and Rubin (1987) defined that language learning strategies as "any sets of operations, steps, plans, routines used by the learner to facilitate the obtaining, storage, retrieval, and use of information."