This document discusses factors that affect pronunciation learning for English language learners. It identifies several linguistic, individual, and instructional factors. Linguistic factors include differences between a learner's native language and English, such as differences in phonemes, stress, and articulation of sounds. Individual factors include age of learning, amount of exposure/immersion in an English-speaking environment, phonetic ability, attitude, motivation, and classroom atmosphere. Instructional factors include prior instruction, teachers' experience and materials, focus of curriculum, class size, and methodology used. The document provides examples and research supporting the influence of these various factors on pronunciation acquisition.