Book excerpt: In the Michigan Classics Edition of Content-Based Second Language Instruction, the authors provide updates on the field of CBI in second language acquisition since 1989. While the core of the book remains the same, new features discuss important CBI-related research and modifications to the pedagogy in the past many years. Content-Based Second Language Instruction, Michigan Classics Edition, now includes: a new preface a glossary of key terms an updated bibliography an epilogue highlighting the major developments in the field since 1989.