These programs and materials provide instruction in one or more areas of reading skill. They are intended for flexible use as part of differentiated instruction or in more intensive interventions to meet student learning needs in specific areas (phonemic awareness, phonics, fluency, vocabulary, or comprehension). When they are used with almost all students in the class because the CCRP does not provide enough instruction and practice in a given area for the majority of students in the class, they are usually referred to as supplemental materials. When they are used to provide targeted, intensive interventions for smaller groups of struggling readers, they are often referred to as intervention materials. Whether referred to as supplemental or intervention materials, these programs provide targeted instruction designed to fill in gaps in student knowledge or skill. These materials can be used to provide either additional instruction or additional practice, or both.