INTERLANGUAGE Introduction In this part, it is discussed that there are differences between teaching and learning. For example, in teaching perspective, anyone may write very well a methodology paper which related desired output to known inputs in a principled way. But in learning perspective, anyone may write very well a paper describing the process of attempted learning of second language. The interlanguage part is written from the learning perspective, regardless of one’s failure or success in the attempted learning of a second language. The concept of interlanguage was suggested by Selinker in order to draw attention to the possibility that the learner’s language can be regarded as a distinct language variety or system with its own particular characteristics and rules. There is a key term which is named ‘meaningful performance’. It is used to refer to the situation where an adult attempts to express meanings, which he or she may already have, in a language which he or she is in the process of learning. The writer thinks that one of our greatest difficulties in establishing a psychology of second language learning which is relevant to the way people actually learn second languages, has been our inability to identify unambiguously the phenomena we wish to study. I agree with the writer, because we have difficulty in learning second language and a correct understanding of this phenomenon leads to the postulation of certain theoretical constructs. These constructs in turn, give us a framework within which we can begin to isolate the psychological relevant data of second language learning.
Interlanguage and Latent Structure There is psychological structure which is latent in the brain, activated when one attempts to learn a second language. Lenneberg coined the term ‘latent psychological structure’. According to him, it is