This report examines student performance on a test composed of items developed to be aligned with the Charleston County School District (CCSD) Language Arts Comprehension Curriculum. The report contains a data analysis section that explains the relationship between two basic concepts of the Rasch measurement model, item difficulty and student ability. The report then discusses curriculum charts which have been constructed for grades 1 through 5. Item difficulty, student ability, and item response patterns were used to analyze group performance on the curriculum objectives within each of the 14 domains of the CCSD Language Arts Comprehension Curriculum. The domains were collapsed into five content areas: vocabulary knowledge; main idea; literal comprehension; inferential comprehension; and analysis of literature. The report includes recommendations within each content area. Ten figures are also included. (MS)