The document summarizes research on personality factors that affect second language acquisition. It discusses theories of self-esteem, attribution, willingness to communicate, anxiety, empathy, extroversion, motivation, and intrinsic motivation in the classroom. Various studies show that affective factors like self-confidence, risk-taking, and facilitating anxiety can have positive effects on language learning, while factors like inhibition and debilitating anxiety may impede success. Teachers are encouraged to consider students' personalities, build self-efficacy, and use motivating techniques to promote language development.