For use with the Words in Color teaching approach, R0 gives your learner practice with the five basic vowel sounds and spellings found on Chart 0 of the wall-sized or desktop charts. Once these sounds and signs are mastered, R1 provides practice for nine new sounds with 20 new spellings. Learners also begin to read simple sentences, and are well prepared to begin decoding the 59 sounds and 400+ spellings in the English langauge.