The majority of students with gifts and talents excel in some areas and not in others. Gifted and talented students can be found in every racial, ethnic, socioeconomic, and linguistic group, but CLD students are underrepresented among those identified as gifted or talented. Some students are twice-exceptional, that is, they have a disability as well as a talent or gift. The key features of differentiated instruction for the gifted and talented are problem-based learning, abstract thinking, reasoning activities, creative problem solving, content mastery, breadth and depth of topics, independent study, and talent development. Acceleration helps students move through the curriculum more rapidly than their peers, whereas enrichment adds topics or skills to the traditional curriculum.