A representative sample of 122,000 eighth-graders participated in the 2011 National Assessment of Educational Progress (NAEP) science assessment, which is designed to measure students' knowledge and abilities in the areas of physical science, life science, and Earth and space sciences. This report covers the overall results, achievement level percentages and average score results, comparison of the average scores in 2009 and 2011 to other states/jurisdictions, average scores for state/jurisdiction and nation (public), results for student groups in 2011, and score gaps for student groups. In 2011, the average score of eighth-grade students in Delaware was 150. This was not significantly different from the average score of 151 for public school students in the nation. The average score for students in Delaware in 2011 (150) was not significantly different from their average score in 2009 (148). In 2011, the score gap between students in Delaware at the 75th percentile and students at the 25th percentile was 43 points. This performance gap was not significantly different from that of 2009 (41 points). The percentage of students in Delaware who performed at or above the NAEP "Proficient" level was 28 percent in 2011. This percentage was greater than that in 2009 (25 percent). The percentage of students in Delaware who performed at or above the NAEP "Basic" level was 63 percent in 2011. This percentage was not significantly different from that in 2009 (62 percent). [For the main report, "The Nation's Report Card: Science 2011. National Assessment of Educational Progress at Grade 8. NCES 2012-465," see ED531894.]