This document discusses several key aspects of second language learning. It states that language learning is an active process that requires learners to use knowledge, not just possess it. It also involves psycho-motor and language processing activities. Language learning is a decision-making process where learners must determine what is new, relevant information. It is not just a matter of linguistic knowledge, but also involves matching conceptual abilities to the language. Learning a second language can be challenging when one's subject knowledge is high but linguistic knowledge is low, as in ESP.