Proven Effective! Learn More This revolutionary program is the first-ever designed to accelerate the reading achievement of beginning English-Language Learners to a reading level at which they can fully participate in core reading instruction along with their English-speaking peers. Zip Zoom Critical-Word Readers are proven to help English-Language Learners gain reading skills at a rate that will close the achievement gap. Look Inside These Books Program Author Dr. Elfrieda Heibert University of California, Berkley Learn More Professional Guide Provides complete instruction for each paired book and supports all three levels of the program. Proven to Work Building Reading Fluency for ELLs Hiebert Study With only 12 weeks of instruction, Zip Zoom Critical-Word Readers accelerated students’ reading fluency at a rate researchers have proposed as necessary for closing the achievement gap. Closing the ELL Achievement Gap Hiebert and Fisher Study Zip Zoom Critical Word Readers helped English language Learners achieve reading fluency above and beyond students who read Open Court decodable books.