"Houghton Mifflin Reading"© is a reading program designed for grades K-6. The program provides step-by-step instruction in reading using Big Books (fiction and nonfiction literature), anthologies, Read Aloud books, and audio compact discs. The product is designed to be used as a full-year curriculum program with instruction on developing oral language, comprehension, phonemic awareness, decoding skills (phonics, analogy, context, and word recognition), fluency, reading comprehension, writing, spelling, and grammar. This review of the program for the Beginning Reading topic area focuses on beginning readers in grades K-3. The What Works Clearinghouse (WWC) identified 10 studies of "Houghton Mifflin Reading"© for beginning readers in grades K-3 that were published or released between 1983 and 2014. Five studies are within the scope of the Beginning Reading review protocol but do not meet WWC group design standards. Five studies are out of the scope of the Beginning Reading review protocol for reasons other than study design. No studies of "Houghton Mifflin Reading"© that fall within the scope of the Beginning Reading review protocol meet WWC group design standards. Because no studies meet WWC group design standards at this time, the WWC is unable to draw any conclusions based on research about the effectiveness or ineffectiveness of "Houghton Mifflin Reading"© on beginning readers in grades K-3. A glossary of terms is included.