The Iowa Test of Basic Skills (ITBS) evaluates a student's educational progress. The test includes sections on vocabulary, word analysis, reading, listening, language, math, social studies and science for students in grades K-2, and vocabulary, reading, spelling, grammar, word usage, math, social studies, science, maps, reference and word recognition for students in grades 3-8. Learn more about the ITBS with our ITBS Guide and our interview with Tim Sitar, ITBS expert.