This document discusses cognitive factors that influence second language learning. It identifies two main categories of internal factors - affective factors like motivation, anxiety, and attitudes; and cognitive factors like intelligence, language aptitude, and learning strategies. Language aptitude includes abilities like identifying sounds, understanding grammar, and memorizing words. Successful language learners employ a variety of learning strategies and teachers can help learners develop strategies that fit their strengths. Individual differences in these factors contribute to differences in how quickly or successfully students learn a new language.