Overview1. INDIVIDUAL DIFFERENCES IN LANGUAGE DEVELOPMENT: WHAT INSTRUCTORS AND ADMINISTRATORS SHOULD KNOW (Cristina Sanz and Beatriz Lado). 2. INDIVIDUAL DIFFERENCES AND SECOND LANGUAGE DEVELOPMENT. Aptitude and acquisition as processing (Bill VanPatten). Older adult learners and SLA: Age in a new light (Jessica Cox). 3. EMPIRICAL STUDIES ON THE ROLE OF INDIVIDUAL DIFFERENCES. The differential roles of language analytic ability and working memory in mediating the effects of two types of feedback on the acquisition of an opaque linguistic structure (Shaofeng Li). Computer-delivered feedback and L2 development: The role of explicitness and working memory (Nuria Sagarra and Rebekha Abbuhl). Finding the right combination for Spanish oral proficiency development: Individual learner characteristics and study abroad program features (Jeff Connor-Linton). 4. INDIVIDUAL DIFFERENCES AND LANGUAGE DEVELOPMENT: THE LEARNER'S PERSPECTIVE. Perceptions of L2 learning through the eyes of students with disabilities (Sally S. Scott, Susan A. Hildebrandt, and Wade A. Edwards). A semester long investigation of Spanish heritage language speakers' attitudes and motivation (��igo Yanguas). 5. INDIVIDUAL DIFFERENCES AND LANGUAGE DEVELOPMENT: CURRICULAR DECISIONS AND TEACHER EDUCATION. The place of individual differences in foreign language teaching assistants' education programs (Nina Moreno). Exploring individual differences among heritage speakers: Initiatives for TA training and program development (Mar�a Luisa Parra). Deaf students in conventional foreign language classrooms (Pilar Pi�ar, Roberto Herrera, and Amanda Holzrichter).