This document summarizes a research study that examined the relationship between language learning strategies and personality traits of extroversion and introversion. The study administered the Myers-Briggs Type Indicator questionnaire to measure extroversion and introversion in Japanese English language learners. It also used the Strategy Inventory for Language Learning to analyze the frequency of different language learning strategies used. The results showed extroverts used functional practice strategies and social-affective strategies significantly more than introverts. For introverts, no clear preferred strategies emerged from the data. The summary concludes by noting implications for teaching strategies and classroom environments to accommodate different personality types.