This document discusses individual learner differences and how they influence second language acquisition. It covers factors like age, intelligence, aptitude, cognitive style, attitudes, motivation and personality. Some key points made are: 1. Starting age affects the rate of learning and levels of accuracy achieved, particularly in pronunciation, but does not affect the route of SLA. 2. Aptitude refers to specific qualities needed for SLA, while intelligence is a more general factor. 3. Integrative and instrumental motivations influence SLA differently. 4. Good language learners can respond to group dynamics, seek out practice opportunities, and use study techniques to supplement direct contact with speakers.