Differentiated Instruction: A Guide for World Language Teachers - Paperbackby Deborah Blaz (Author) In the third edition of a bestseller, author Deborah Blaz helps you differentiate lessons for your world language students based on their learning styles, interests, prior knowledge, and comfort zones. Author Biography Deborah Blaz has taught French to grades 7 through 12 for the past 44 years in Indiana and has taught dual credit, AP, and college classes. She also served as the world language department chair at her school