The term language learning strategy has been defined by many researchers. Wenden and Rubin (1987:19) define learning strategies as "... any sets of operations, steps, plans, routines used by the learner to facilitate the obtaining, storage, retrieval, and use of information." Richards and Platt (1992:209) state that learning strategies are "intentional behavior and thoughts used by learners during learning so as to better help them understand, learn, or remember new information." Faerch Claus and Casper (1983:67) stress that a learning strategy is "an attempt to develop linguistic and sociolinguistic competence in the target language." According to Stern (1992:261), "the concept of learning strategy is dependent on the assumption that learners consciously engage in activities to achieve certain goals and learning strategies can be regarded as broadly conceived intentional directions and learning techniques." All language learners use language learning strategies either consciously or unconsciously when processing new information and performing tasks in the language classroom. Since language classroom is like a problem-solving environment in which language learners are likely to face new input and difficult tasks given by their instructors, learners' attempts to find the quickest or easiest way to do what is required, that is, using language learning strategies is inescapable.
Language learning strategies language learners use during the act of processing the new information and performing tasks have been identified and described by researchers. In the following section, how various researchers have categorized language learning strategies will be shortly summarized